/*
 * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 *  Freescale DIU Frame Buffer device driver
 *
 *  Authors: Hongjun Chen <hong-jun.chen@freescale.com>
 *           Paul Widmer <paul.widmer@freescale.com>
 *           Srikanth Srinivasan <srikanth.srinivasan@freescale.com>
 *           York Sun <yorksun@freescale.com>
 *
 *   Based on imxfb.c Copyright (C) 2004 S.Hauer, Pengutronix
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/spinlock.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>

#include <sysdev/fsl_soc.h>
#include <linux/fsl-diu-fb.h>
#include "edid.h"

#define NUM_AOIS        5       /* 1 for plane 0, 2 for planes 1 & 2 each */

/* HW cursor parameters */
#define MAX_CURS                32

/* INT_STATUS/INT_MASK field descriptions */
#define INT_VSYNC       0x01    /* Vsync interrupt  */
#define INT_VSYNC_WB    0x02    /* Vsync interrupt for write back operation */
#define INT_UNDRUN      0x04    /* Under run exception interrupt */
#define INT_PARERR      0x08    /* Display parameters error interrupt */
#define INT_LS_BF_VS    0x10    /* Lines before vsync. interrupt */

/*
 * List of supported video modes
 *
 * The first entry is the default video mode.  The remain entries are in
 * order if increasing resolution and frequency.  The 320x240-60 mode is
 * the initial AOI for the second and third planes.
 */
static struct fb_videomode fsl_diu_mode_db[] = {
        {
                .refresh        = 60,
                .xres           = 1024,
                .yres           = 768,
                .pixclock       = 15385,
                .left_margin    = 160,
                .right_margin   = 24,
                .upper_margin   = 29,
                .lower_margin   = 3,
                .hsync_len      = 136,
                .vsync_len      = 6,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 60,
                .xres           = 320,
                .yres           = 240,
                .pixclock       = 79440,
                .left_margin    = 16,
                .right_margin   = 16,
                .upper_margin   = 16,
                .lower_margin   = 5,
                .hsync_len      = 48,
                .vsync_len      = 1,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 60,
                .xres           = 640,
                .yres           = 480,
                .pixclock       = 39722,
                .left_margin    = 48,
                .right_margin   = 16,
                .upper_margin   = 33,
                .lower_margin   = 10,
                .hsync_len      = 96,
                .vsync_len      = 2,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 72,
                .xres           = 640,
                .yres           = 480,
                .pixclock       = 32052,
                .left_margin    = 128,
                .right_margin   = 24,
                .upper_margin   = 28,
                .lower_margin   = 9,
                .hsync_len      = 40,
                .vsync_len      = 3,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 75,
                .xres           = 640,
                .yres           = 480,
                .pixclock       = 31747,
                .left_margin    = 120,
                .right_margin   = 16,
                .upper_margin   = 16,
                .lower_margin   = 1,
                .hsync_len      = 64,
                .vsync_len      = 3,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 90,
                .xres           = 640,
                .yres           = 480,
                .pixclock       = 25057,
                .left_margin    = 120,
                .right_margin   = 32,
                .upper_margin   = 14,
                .lower_margin   = 25,
                .hsync_len      = 40,
                .vsync_len      = 14,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 100,
                .xres           = 640,
                .yres           = 480,
                .pixclock       = 22272,
                .left_margin    = 48,
                .right_margin   = 32,
                .upper_margin   = 17,
                .lower_margin   = 22,
                .hsync_len      = 128,
                .vsync_len      = 12,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 60,
                .xres           = 800,
                .yres           = 480,
                .pixclock       = 33805,
                .left_margin    = 96,
                .right_margin   = 24,
                .upper_margin   = 10,
                .lower_margin   = 3,
                .hsync_len      = 72,
                .vsync_len      = 7,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 60,
                .xres           = 800,
                .yres           = 600,
                .pixclock       = 25000,
                .left_margin    = 88,
                .right_margin   = 40,
                .upper_margin   = 23,
                .lower_margin   = 1,
                .hsync_len      = 128,
                .vsync_len      = 4,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 60,
                .xres           = 854,
                .yres           = 480,
                .pixclock       = 31518,
                .left_margin    = 104,
                .right_margin   = 16,
                .upper_margin   = 13,
                .lower_margin   = 1,
                .hsync_len      = 88,
                .vsync_len      = 3,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 70,
                .xres           = 1024,
                .yres           = 768,
                .pixclock       = 16886,
                .left_margin    = 3,
                .right_margin   = 3,
                .upper_margin   = 2,
                .lower_margin   = 2,
                .hsync_len      = 40,
                .vsync_len      = 18,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 75,
                .xres           = 1024,
                .yres           = 768,
                .pixclock       = 15009,
                .left_margin    = 3,
                .right_margin   = 3,
                .upper_margin   = 2,
                .lower_margin   = 2,
                .hsync_len      = 80,
                .vsync_len      = 32,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 60,
                .xres           = 1280,
                .yres           = 480,
                .pixclock       = 18939,
                .left_margin    = 353,
                .right_margin   = 47,
                .upper_margin   = 39,
                .lower_margin   = 4,
                .hsync_len      = 8,
                .vsync_len      = 2,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 60,
                .xres           = 1280,
                .yres           = 720,
                .pixclock       = 13426,
                .left_margin    = 192,
                .right_margin   = 64,
                .upper_margin   = 22,
                .lower_margin   = 1,
                .hsync_len      = 136,
                .vsync_len      = 3,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 60,
                .xres           = 1280,
                .yres           = 1024,
                .pixclock       = 9375,
                .left_margin    = 38,
                .right_margin   = 128,
                .upper_margin   = 2,
                .lower_margin   = 7,
                .hsync_len      = 216,
                .vsync_len      = 37,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 70,
                .xres           = 1280,
                .yres           = 1024,
                .pixclock       = 9380,
                .left_margin    = 6,
                .right_margin   = 6,
                .upper_margin   = 4,
                .lower_margin   = 4,
                .hsync_len      = 60,
                .vsync_len      = 94,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 75,
                .xres           = 1280,
                .yres           = 1024,
                .pixclock       = 9380,
                .left_margin    = 6,
                .right_margin   = 6,
                .upper_margin   = 4,
                .lower_margin   = 4,
                .hsync_len      = 60,
                .vsync_len      = 15,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
        {
                .refresh        = 60,
                .xres           = 1920,
                .yres           = 1080,
                .pixclock       = 5787,
                .left_margin    = 328,
                .right_margin   = 120,
                .upper_margin   = 34,
                .lower_margin   = 1,
                .hsync_len      = 208,
                .vsync_len      = 3,
                .sync           = FB_SYNC_COMP_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
                .vmode          = FB_VMODE_NONINTERLACED
        },
};

static char *fb_mode;
static unsigned long default_bpp = 32;
static enum fsl_diu_monitor_port monitor_port;
static char *monitor_string;

#if defined(CONFIG_NOT_COHERENT_CACHE)
static u8 *coherence_data;
static size_t coherence_data_size;
static unsigned int d_cache_line_size;
#endif

static DEFINE_SPINLOCK(diu_lock);

enum mfb_index {
        PLANE0 = 0,     /* Plane 0, only one AOI that fills the screen */
        PLANE1_AOI0,    /* Plane 1, first AOI */
        PLANE1_AOI1,    /* Plane 1, second AOI */
        PLANE2_AOI0,    /* Plane 2, first AOI */
        PLANE2_AOI1,    /* Plane 2, second AOI */
};

struct mfb_info {
        enum mfb_index index;
        char *id;
        int registered;
        unsigned long pseudo_palette[16];
        struct diu_ad *ad;
        unsigned char g_alpha;
        unsigned int count;
        int x_aoi_d;            /* aoi display x offset to physical screen */
        int y_aoi_d;            /* aoi display y offset to physical screen */
        struct fsl_diu_data *parent;
};

/**
 * struct fsl_diu_data - per-DIU data structure
 * @dma_addr: DMA address of this structure
 * @fsl_diu_info: fb_info objects, one per AOI
 * @dev_attr: sysfs structure
 * @irq: IRQ
 * @monitor_port: the monitor port this DIU is connected to
 * @diu_reg: pointer to the DIU hardware registers
 * @reg_lock: spinlock for register access
 * @dummy_aoi: video buffer for the 4x4 32-bit dummy AOI
 * dummy_ad: DIU Area Descriptor for the dummy AOI
 * @ad[]: Area Descriptors for each real AOI
 * @gamma: gamma color table
 * @cursor: hardware cursor data
 *
 * This data structure must be allocated with 32-byte alignment, so that the
 * internal fields can be aligned properly.
 */
struct fsl_diu_data {
        dma_addr_t dma_addr;
        struct fb_info fsl_diu_info[NUM_AOIS];
        struct mfb_info mfb[NUM_AOIS];
        struct device_attribute dev_attr;
        unsigned int irq;
        enum fsl_diu_monitor_port monitor_port;
        struct diu __iomem *diu_reg;
        spinlock_t reg_lock;
        u8 dummy_aoi[4 * 4 * 4];
        struct diu_ad dummy_ad __aligned(8);
        struct diu_ad ad[NUM_AOIS] __aligned(8);
        u8 gamma[256 * 3] __aligned(32);
        /* It's easier to parse the cursor data as little-endian */
        __le16 cursor[MAX_CURS * MAX_CURS] __aligned(32);
        /* Blank cursor data -- used to hide the cursor */
        __le16 blank_cursor[MAX_CURS * MAX_CURS] __aligned(32);
        uint8_t edid_data[EDID_LENGTH];
        bool has_edid;
} __aligned(32);

/* Determine the DMA address of a member of the fsl_diu_data structure */
#define DMA_ADDR(p, f) ((p)->dma_addr + offsetof(struct fsl_diu_data, f))

static const struct mfb_info mfb_template[] = {
        {
                .index = PLANE0,
                .id = "Panel0",
                .registered = 0,
                .count = 0,
                .x_aoi_d = 0,
                .y_aoi_d = 0,
        },
        {
                .index = PLANE1_AOI0,
                .id = "Panel1 AOI0",
                .registered = 0,
                .g_alpha = 0xff,
                .count = 0,
                .x_aoi_d = 0,
                .y_aoi_d = 0,
        },
        {
                .index = PLANE1_AOI1,
                .id = "Panel1 AOI1",
                .registered = 0,
                .g_alpha = 0xff,
                .count = 0,
                .x_aoi_d = 0,
                .y_aoi_d = 480,
        },
        {
                .index = PLANE2_AOI0,
                .id = "Panel2 AOI0",
                .registered = 0,
                .g_alpha = 0xff,
                .count = 0,
                .x_aoi_d = 640,
                .y_aoi_d = 0,
        },
        {
                .index = PLANE2_AOI1,
                .id = "Panel2 AOI1",
                .registered = 0,
                .g_alpha = 0xff,
                .count = 0,
                .x_aoi_d = 640,
                .y_aoi_d = 480,
        },
};

#ifdef DEBUG
static void __attribute__ ((unused)) fsl_diu_dump(struct diu __iomem *hw)
{
        mb();
        pr_debug("DIU: desc=%08x,%08x,%08x, gamma=%08x palette=%08x "
                 "cursor=%08x curs_pos=%08x diu_mode=%08x bgnd=%08x "
                 "disp_size=%08x hsyn_para=%08x vsyn_para=%08x syn_pol=%08x "
                 "thresholds=%08x int_mask=%08x plut=%08x\n",
                 hw->desc[0], hw->desc[1], hw->desc[2], hw->gamma,
                 hw->palette, hw->cursor, hw->curs_pos, hw->diu_mode,
                 hw->bgnd, hw->disp_size, hw->hsyn_para, hw->vsyn_para,
                 hw->syn_pol, hw->thresholds, hw->int_mask, hw->plut);
        rmb();
}
#endif

/**
 * fsl_diu_name_to_port - convert a port name to a monitor port enum
 *
 * Takes the name of a monitor port ("dvi", "lvds", or "dlvds") and returns
 * the enum fsl_diu_monitor_port that corresponds to that string.
 *
 * For compatibility with older versions, a number ("0", "1", or "2") is also
 * supported.
 *
 * If the string is unknown, DVI is assumed.
 *
 * If the particular port is not supported by the platform, another port
 * (platform-specific) is chosen instead.
 */
static enum fsl_diu_monitor_port fsl_diu_name_to_port(const char *s)
{
        enum fsl_diu_monitor_port port = FSL_DIU_PORT_DVI;
        unsigned long val;

        if (s) {
                if (!kstrtoul(s, 10, &val) && (val <= 2))
                        port = (enum fsl_diu_monitor_port) val;
                else if (strncmp(s, "lvds", 4) == 0)
                        port = FSL_DIU_PORT_LVDS;
                else if (strncmp(s, "dlvds", 5) == 0)
                        port = FSL_DIU_PORT_DLVDS;
        }

        if (diu_ops.valid_monitor_port)
                port = diu_ops.valid_monitor_port(port);

        return port;
}

/*
 * Workaround for failed writing desc register of planes.
 * Needed with MPC5121 DIU rev 2.0 silicon.
 */
void wr_reg_wa(u32 *reg, u32 val)
{
        do {
                out_be32(reg, val);
        } while (in_be32(reg) != val);
}

static void fsl_diu_enable_panel(struct fb_info *info)
{
        struct mfb_info *pmfbi, *cmfbi, *mfbi = info->par;
        struct diu_ad *ad = mfbi->ad;
        struct fsl_diu_data *data = mfbi->parent;
        struct diu __iomem *hw = data->diu_reg;

        switch (mfbi->index) {
        case PLANE0:
                wr_reg_wa(&hw->desc[0], ad->paddr);
                break;
        case PLANE1_AOI0:
                cmfbi = &data->mfb[2];
                if (hw->desc[1] != ad->paddr) { /* AOI0 closed */
                        if (cmfbi->count > 0)   /* AOI1 open */
                                ad->next_ad =
                                        cpu_to_le32(cmfbi->ad->paddr);
                        else
                                ad->next_ad = 0;
                        wr_reg_wa(&hw->desc[1], ad->paddr);
                }
                break;
        case PLANE2_AOI0:
                cmfbi = &data->mfb[4];
                if (hw->desc[2] != ad->paddr) { /* AOI0 closed */
                        if (cmfbi->count > 0)   /* AOI1 open */
                                ad->next_ad =
                                        cpu_to_le32(cmfbi->ad->paddr);
                        else
                                ad->next_ad = 0;
                        wr_reg_wa(&hw->desc[2], ad->paddr);
                }
                break;
        case PLANE1_AOI1:
                pmfbi = &data->mfb[1];
                ad->next_ad = 0;
                if (hw->desc[1] == data->dummy_ad.paddr)
                        wr_reg_wa(&hw->desc[1], ad->paddr);
                else                                    /* AOI0 open */
                        pmfbi->ad->next_ad = cpu_to_le32(ad->paddr);
                break;
        case PLANE2_AOI1:
                pmfbi = &data->mfb[3];
                ad->next_ad = 0;
                if (hw->desc[2] == data->dummy_ad.paddr)
                        wr_reg_wa(&hw->desc[2], ad->paddr);
                else                            /* AOI0 was open */
                        pmfbi->ad->next_ad = cpu_to_le32(ad->paddr);
                break;
        }
}

static void fsl_diu_disable_panel(struct fb_info *info)
{
        struct mfb_info *pmfbi, *cmfbi, *mfbi = info->par;
        struct diu_ad *ad = mfbi->ad;
        struct fsl_diu_data *data = mfbi->parent;
        struct diu __iomem *hw = data->diu_reg;

        switch (mfbi->index) {
        case PLANE0:
                wr_reg_wa(&hw->desc[0], 0);
                break;
        case PLANE1_AOI0:
                cmfbi = &data->mfb[2];
                if (cmfbi->count > 0)   /* AOI1 is open */
                        wr_reg_wa(&hw->desc[1], cmfbi->ad->paddr);
                                        /* move AOI1 to the first */
                else                    /* AOI1 was closed */
                        wr_reg_wa(&hw->desc[1], data->dummy_ad.paddr);
                                        /* close AOI 0 */
                break;
        case PLANE2_AOI0:
                cmfbi = &data->mfb[4];
                if (cmfbi->count > 0)   /* AOI1 is open */
                        wr_reg_wa(&hw->desc[2], cmfbi->ad->paddr);
                                        /* move AOI1 to the first */
                else                    /* AOI1 was closed */
                        wr_reg_wa(&hw->desc[2], data->dummy_ad.paddr);
                                        /* close AOI 0 */
                break;
        case PLANE1_AOI1:
                pmfbi = &data->mfb[1];
                if (hw->desc[1] != ad->paddr) {
                                /* AOI1 is not the first in the chain */
                        if (pmfbi->count > 0)
                                        /* AOI0 is open, must be the first */
                                pmfbi->ad->next_ad = 0;
                } else                  /* AOI1 is the first in the chain */
                        wr_reg_wa(&hw->desc[1], data->dummy_ad.paddr);
                                        /* close AOI 1 */
                break;
        case PLANE2_AOI1:
                pmfbi = &data->mfb[3];
                if (hw->desc[2] != ad->paddr) {
                                /* AOI1 is not the first in the chain */
                        if (pmfbi->count > 0)
                                /* AOI0 is open, must be the first */
                                pmfbi->ad->next_ad = 0;
                } else          /* AOI1 is the first in the chain */
                        wr_reg_wa(&hw->desc[2], data->dummy_ad.paddr);
                                /* close AOI 1 */
                break;
        }
}

static void enable_lcdc(struct fb_info *info)
{
        struct mfb_info *mfbi = info->par;
        struct fsl_diu_data *data = mfbi->parent;
        struct diu __iomem *hw = data->diu_reg;

        out_be32(&hw->diu_mode, MFB_MODE1);
}

static void disable_lcdc(struct fb_info *info)
{
        struct mfb_info *mfbi = info->par;
        struct fsl_diu_data *data = mfbi->parent;
        struct diu __iomem *hw = data->diu_reg;

        out_be32(&hw->diu_mode, 0);
}

static void adjust_aoi_size_position(struct fb_var_screeninfo *var,
                                struct fb_info *info)
{
        struct mfb_info *lower_aoi_mfbi, *upper_aoi_mfbi, *mfbi = info->par;
        struct fsl_diu_data *data = mfbi->parent;
        int available_height, upper_aoi_bottom;
        enum mfb_index index = mfbi->index;
        int lower_aoi_is_open, upper_aoi_is_open;
        __u32 base_plane_width, base_plane_height, upper_aoi_height;

        base_plane_width = data->fsl_diu_info[0].var.xres;
        base_plane_height = data->fsl_diu_info[0].var.yres;

        if (mfbi->x_aoi_d < 0)
                mfbi->x_aoi_d = 0;
        if (mfbi->y_aoi_d < 0)
                mfbi->y_aoi_d = 0;
        switch (index) {
        case PLANE0:
                if (mfbi->x_aoi_d != 0)
                        mfbi->x_aoi_d = 0;
                if (mfbi->y_aoi_d != 0)
                        mfbi->y_aoi_d = 0;
                break;
        case PLANE1_AOI0:
        case PLANE2_AOI0:
                lower_aoi_mfbi = data->fsl_diu_info[index+1].par;
                lower_aoi_is_open = lower_aoi_mfbi->count > 0 ? 1 : 0;
                if (var->xres > base_plane_width)
                        var->xres = base_plane_width;
                if ((mfbi->x_aoi_d + var->xres) > base_plane_width)
                        mfbi->x_aoi_d = base_plane_width - var->xres;

                if (lower_aoi_is_open)
                        available_height = lower_aoi_mfbi->y_aoi_d;
                else
                        available_height = base_plane_height;
                if (var->yres > available_height)
                        var->yres = available_height;
                if ((mfbi->y_aoi_d + var->yres) > available_height)
                        mfbi->y_aoi_d = available_height - var->yres;
                break;
        case PLANE1_AOI1:
        case PLANE2_AOI1:
                upper_aoi_mfbi = data->fsl_diu_info[index-1].par;
                upper_aoi_height = data->fsl_diu_info[index-1].var.yres;
                upper_aoi_bottom = upper_aoi_mfbi->y_aoi_d + upper_aoi_height;
                upper_aoi_is_open = upper_aoi_mfbi->count > 0 ? 1 : 0;
                if (var->xres > base_plane_width)
                        var->xres = base_plane_width;
                if ((mfbi->x_aoi_d + var->xres) > base_plane_width)
                        mfbi->x_aoi_d = base_plane_width - var->xres;
                if (mfbi->y_aoi_d < 0)
                        mfbi->y_aoi_d = 0;
                if (upper_aoi_is_open) {
                        if (mfbi->y_aoi_d < upper_aoi_bottom)
                                mfbi->y_aoi_d = upper_aoi_bottom;
                        available_height = base_plane_height
                                                - upper_aoi_bottom;
                } else
                        available_height = base_plane_height;
                if (var->yres > available_height)
                        var->yres = available_height;
                if ((mfbi->y_aoi_d + var->yres) > base_plane_height)
                        mfbi->y_aoi_d = base_plane_height - var->yres;
                break;
        }
}
/*
 * Checks to see if the hardware supports the state requested by var passed
 * in. This function does not alter the hardware state! If the var passed in
 * is slightly off by what the hardware can support then we alter the var
 * PASSED in to what we can do. If the hardware doesn't support mode change
 * a -EINVAL will be returned by the upper layers.
 */
static int fsl_diu_check_var(struct fb_var_screeninfo *var,
                                struct fb_info *info)
{
        if (var->xres_virtual < var->xres)
                var->xres_virtual = var->xres;
        if (var->yres_virtual < var->yres)
                var->yres_virtual = var->yres;

        if (var->xoffset + info->var.xres > info->var.xres_virtual)
                var->xoffset = info->var.xres_virtual - info->var.xres;

        if (var->yoffset + info->var.yres > info->var.yres_virtual)
                var->yoffset = info->var.yres_virtual - info->var.yres;

        if ((var->bits_per_pixel != 32) && (var->bits_per_pixel != 24) &&
            (var->bits_per_pixel != 16))
                var->bits_per_pixel = default_bpp;

        switch (var->bits_per_pixel) {
        case 16:
                var->red.length = 5;
                var->red.offset = 11;
                var->red.msb_right = 0;

                var->green.length = 6;
                var->green.offset = 5;
                var->green.msb_right = 0;

                var->blue.length = 5;
                var->blue.offset = 0;
                var->blue.msb_right = 0;

                var->transp.length = 0;
                var->transp.offset = 0;
                var->transp.msb_right = 0;
                break;
        case 24:
                var->red.length = 8;
                var->red.offset = 0;
                var->red.msb_right = 0;

                var->green.length = 8;
                var->green.offset = 8;
                var->green.msb_right = 0;

                var->blue.length = 8;
                var->blue.offset = 16;
                var->blue.msb_right = 0;

                var->transp.length = 0;
                var->transp.offset = 0;
                var->transp.msb_right = 0;
                break;
        case 32:
                var->red.length = 8;
                var->red.offset = 16;
                var->red.msb_right = 0;

                var->green.length = 8;
                var->green.offset = 8;
                var->green.msb_right = 0;

                var->blue.length = 8;
                var->blue.offset = 0;
                var->blue.msb_right = 0;

                var->transp.length = 8;
                var->transp.offset = 24;
                var->transp.msb_right = 0;

                break;
        }

        var->height = -1;
        var->width = -1;
        var->grayscale = 0;

        /* Copy nonstd field to/from sync for fbset usage */
        var->sync |= var->nonstd;
        var->nonstd |= var->sync;

        adjust_aoi_size_position(var, info);
        return 0;
}

static void set_fix(struct fb_info *info)
{
        struct fb_fix_screeninfo *fix = &info->fix;
        struct fb_var_screeninfo *var = &info->var;
        struct mfb_info *mfbi = info->par;

        strncpy(fix->id, mfbi->id, sizeof(fix->id));
        fix->line_length = var->xres_virtual * var->bits_per_pixel / 8;
        fix->type = FB_TYPE_PACKED_PIXELS;
        fix->accel = FB_ACCEL_NONE;
        fix->visual = FB_VISUAL_TRUECOLOR;
        fix->xpanstep = 1;
        fix->ypanstep = 1;
}

static void update_lcdc(struct fb_info *info)
{
        struct fb_var_screeninfo *var = &info->var;
        struct mfb_info *mfbi = info->par;
        struct fsl_diu_data *data = mfbi->parent;
        struct diu __iomem *hw;
        int i, j;
        u8 *gamma_table_base;

        u32 temp;

        hw = data->diu_reg;

        if (diu_ops.set_monitor_port)
                diu_ops.set_monitor_port(data->monitor_port);
        gamma_table_base = data->gamma;

        /* Prep for DIU init  - gamma table, cursor table */

        for (i = 0; i <= 2; i++)
                for (j = 0; j <= 255; j++)
                        *gamma_table_base++ = j;

        if (diu_ops.set_gamma_table)
                diu_ops.set_gamma_table(data->monitor_port, data->gamma);

        disable_lcdc(info);

        /* Program DIU registers */

        out_be32(&hw->gamma, DMA_ADDR(data, gamma));

        out_be32(&hw->bgnd, 0x007F7F7F); /* Set background to grey */
        out_be32(&hw->disp_size, (var->yres << 16) | var->xres);

        /* Horizontal and vertical configuration register */
        temp = var->left_margin << 22 | /* BP_H */
               var->hsync_len << 11 |   /* PW_H */
               var->right_margin;       /* FP_H */

        out_be32(&hw->hsyn_para, temp);

        temp = var->upper_margin << 22 | /* BP_V */
               var->vsync_len << 11 |    /* PW_V  */
               var->lower_margin;        /* FP_V  */

        out_be32(&hw->vsyn_para, temp);

        diu_ops.set_pixel_clock(var->pixclock);

#ifndef CONFIG_PPC_MPC512x
        /*
         * The PLUT register is defined differently on the MPC5121 than it
         * is on other SOCs.  Unfortunately, there's no documentation that
         * explains how it's supposed to be programmed, so for now, we leave
         * it at the default value on the MPC5121.
         *
         * For other SOCs, program it for the highest priority, which will
         * reduce the chance of underrun. Technically, we should scale the
         * priority to match the screen resolution, but doing that properly
         * requires delicate fine-tuning for each use-case.
         */
        out_be32(&hw->plut, 0x01F5F666);
#endif

        /* Enable the DIU */
        enable_lcdc(info);
}

static int map_video_memory(struct fb_info *info)
{
        u32 smem_len = info->fix.line_length * info->var.yres_virtual;
        void *p;

        p = alloc_pages_exact(smem_len, GFP_DMA | __GFP_ZERO);
        if (!p) {
                dev_err(info->dev, "unable to allocate fb memory\n");
                return -ENOMEM;
        }
        mutex_lock(&info->mm_lock);
        info->screen_base = p;
        info->fix.smem_start = virt_to_phys(info->screen_base);
        info->fix.smem_len = smem_len;
        mutex_unlock(&info->mm_lock);
        info->screen_size = info->fix.smem_len;

        return 0;
}

static void unmap_video_memory(struct fb_info *info)
{
        void *p = info->screen_base;
        size_t l = info->fix.smem_len;

        mutex_lock(&info->mm_lock);
        info->screen_base = NULL;
        info->fix.smem_start = 0;
        info->fix.smem_len = 0;
        mutex_unlock(&info->mm_lock);

        if (p)
                free_pages_exact(p, l);
}

/*
 * Using the fb_var_screeninfo in fb_info we set the aoi of this
 * particular framebuffer. It is a light version of fsl_diu_set_par.
 */
static int fsl_diu_set_aoi(struct fb_info *info)
{
        struct fb_var_screeninfo *var = &info->var;
        struct mfb_info *mfbi = info->par;
        struct diu_ad *ad = mfbi->ad;

        /* AOI should not be greater than display size */
        ad->offset_xyi = cpu_to_le32((var->yoffset << 16) | var->xoffset);
        ad->offset_xyd = cpu_to_le32((mfbi->y_aoi_d << 16) | mfbi->x_aoi_d);
        return 0;
}

/**
 * fsl_diu_get_pixel_format: return the pixel format for a given color depth
 *
 * The pixel format is a 32-bit value that determine which bits in each
 * pixel are to be used for each color.  This is the default function used
 * if the platform does not define its own version.
 */
static u32 fsl_diu_get_pixel_format(unsigned int bits_per_pixel)
{
#define PF_BYTE_F               0x10000000
#define PF_ALPHA_C_MASK         0x0E000000
#define PF_ALPHA_C_SHIFT        25
#define PF_BLUE_C_MASK          0x01800000
#define PF_BLUE_C_SHIFT         23
#define PF_GREEN_C_MASK         0x00600000
#define PF_GREEN_C_SHIFT        21
#define PF_RED_C_MASK           0x00180000
#define PF_RED_C_SHIFT          19
#define PF_PALETTE              0x00040000
#define PF_PIXEL_S_MASK         0x00030000
#define PF_PIXEL_S_SHIFT        16
#define PF_COMP_3_MASK          0x0000F000
#define PF_COMP_3_SHIFT         12
#define PF_COMP_2_MASK          0x00000F00
#define PF_COMP_2_SHIFT         8
#define PF_COMP_1_MASK          0x000000F0
#define PF_COMP_1_SHIFT         4
#define PF_COMP_0_MASK          0x0000000F
#define PF_COMP_0_SHIFT         0

#define MAKE_PF(alpha, red, green, blue, size, c0, c1, c2, c3) \
        cpu_to_le32(PF_BYTE_F | (alpha << PF_ALPHA_C_SHIFT) | \
        (blue << PF_BLUE_C_SHIFT) | (green << PF_GREEN_C_SHIFT) | \
        (red << PF_RED_C_SHIFT) | (c3 << PF_COMP_3_SHIFT) | \
        (c2 << PF_COMP_2_SHIFT) | (c1 << PF_COMP_1_SHIFT) | \
        (c0 << PF_COMP_0_SHIFT) | (size << PF_PIXEL_S_SHIFT))

        switch (bits_per_pixel) {
        case 32:
                /* 0x88883316 */
                return MAKE_PF(3, 2, 1, 0, 3, 8, 8, 8, 8);
        case 24:
                /* 0x88082219 */
                return MAKE_PF(4, 0, 1, 2, 2, 8, 8, 8, 0);
        case 16:
                /* 0x65053118 */
                return MAKE_PF(4, 2, 1, 0, 1, 5, 6, 5, 0);
        default:
                pr_err("fsl-diu: unsupported color depth %u\n", bits_per_pixel);
                return 0;
        }
}

/*
 * Copies a cursor image from user space to the proper place in driver
 * memory so that the hardware can display the cursor image.
 *
 * Cursor data is represented as a sequence of 'width' bits packed into bytes.
 * That is, the first 8 bits are in the first byte, the second 8 bits in the
 * second byte, and so on.  Therefore, the each row of the cursor is (width +
 * 7) / 8 bytes of 'data'
 *
 * The DIU only supports cursors up to 32x32 (MAX_CURS).  We reject cursors
 * larger than this, so we already know that 'width' <= 32.  Therefore, we can
 * simplify our code by using a 32-bit big-endian integer ("line") to read in
 * a single line of pixels, and only look at the top 'width' bits of that
 * integer.
 *
 * This could result in an unaligned 32-bit read.  For example, if the cursor
 * is 24x24, then the first three bytes of 'image' contain the pixel data for
 * the top line of the cursor.  We do a 32-bit read of 'image', but we look
 * only at the top 24 bits.  Then we increment 'image' by 3 bytes.  The next
 * read is unaligned.  The only problem is that we might read past the end of
 * 'image' by 1-3 bytes, but that should not cause any problems.
 */
static void fsl_diu_load_cursor_image(struct fb_info *info,
        const void *image, uint16_t bg, uint16_t fg,
        unsigned int width, unsigned int height)
{
        struct mfb_info *mfbi = info->par;
        struct fsl_diu_data *data = mfbi->parent;
        __le16 *cursor = data->cursor;
        __le16 _fg = cpu_to_le16(fg);

        __le16 _bg = cpu_to_le16(bg);
        unsigned int h, w;

        for (h = 0; h < height; h++) {
                uint32_t mask = 1 << 31;
                uint32_t line = be32_to_cpup(image);

                for (w = 0; w < width; w++) {
                        cursor[w] = (line & mask) ? _fg : _bg;
                        mask >>= 1;
                }

                cursor += MAX_CURS;
                image += DIV_ROUND_UP(width, 8);
        }
}

/*
 * Set a hardware cursor.  The image data for the cursor is passed via the
 * fb_cursor object.
 */
static int fsl_diu_cursor(struct fb_info *info, struct fb_cursor *cursor)
{
        struct mfb_info *mfbi = info->par;
        struct fsl_diu_data *data = mfbi->parent;
        struct diu __iomem *hw = data->diu_reg;

        if (cursor->image.width > MAX_CURS || cursor->image.height > MAX_CURS)
                return -EINVAL;

        /* The cursor size has changed */
        if (cursor->set & FB_CUR_SETSIZE) {
                /*
                 * The DIU cursor is a fixed size, so when we get this
                 * message, instead of resizing the cursor, we just clear
                 * all the image data, in expectation of new data.  However,
                 * in tests this control does not appear to be normally
                 * called.
                 */
                memset(data->cursor, 0, sizeof(data->cursor));
        }

        /* The cursor position has changed (cursor->image.dx|dy) */
        if (cursor->set & FB_CUR_SETPOS) {
                uint32_t xx, yy;

                yy = (cursor->image.dy - info->var.yoffset) & 0x7ff;
                xx = (cursor->image.dx - info->var.xoffset) & 0x7ff;

                out_be32(&hw->curs_pos, yy << 16 | xx);
        }

        /*
         * FB_CUR_SETIMAGE - the cursor image has changed
         * FB_CUR_SETCMAP  - the cursor colors has changed
         * FB_CUR_SETSHAPE - the cursor bitmask has changed
         */
        if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETCMAP | FB_CUR_SETIMAGE)) {
                unsigned int image_size =
                        DIV_ROUND_UP(cursor->image.width, 8) * cursor->image.height;
                unsigned int image_words =
                        DIV_ROUND_UP(image_size, sizeof(uint32_t));
                unsigned int bg_idx = cursor->image.bg_color;
                unsigned int fg_idx = cursor->image.fg_color;
                uint8_t buffer[image_size];
                uint32_t *image, *source, *mask;
                uint16_t fg, bg;
                unsigned int i;

                if (info->state != FBINFO_STATE_RUNNING)
                        return 0;

                /*
                 * Determine the size of the cursor image data.  Normally,
                 * it's 8x16.
                 */
                image_size = DIV_ROUND_UP(cursor->image.width, 8) *
                        cursor->image.height;

                bg = ((info->cmap.red[bg_idx] & 0xf8) << 7) |
                     ((info->cmap.green[bg_idx] & 0xf8) << 2) |
                     ((info->cmap.blue[bg_idx] & 0xf8) >> 3) |
                     1 << 15;

                fg = ((info->cmap.red[fg_idx] & 0xf8) << 7) |
                     ((info->cmap.green[fg_idx] & 0xf8) << 2) |
                     ((info->cmap.blue[fg_idx] & 0xf8) >> 3) |
                     1 << 15;

                /* Use 32-bit operations on the data to improve performance */
                image = (uint32_t *)buffer;
                source = (uint32_t *)cursor->image.data;
                mask = (uint32_t *)cursor->mask;

                if (cursor->rop == ROP_XOR)
                        for (i = 0; i < image_words; i++)
                                image[i] = source[i] ^ mask[i];
                else
                        for (i = 0; i < image_words; i++)
                                image[i] = source[i] & mask[i];

                fsl_diu_load_cursor_image(info, image, bg, fg,
                        cursor->image.width, cursor->image.height);
        }

        /*
         * Show or hide the cursor.  The cursor data is always stored in the
         * 'cursor' memory block, and the actual cursor position is always in
         * the DIU's CURS_POS register.  To hide the cursor, we redirect the
         * CURSOR register to a blank cursor.  The show the cursor, we
         * redirect the CURSOR register to the real cursor data.
         */
        if (cursor->enable)
                out_be32(&hw->cursor, DMA_ADDR(data, cursor));
        else
                out_be32(&hw->cursor, DMA_ADDR(data, blank_cursor));

        return 0;
}

/*
 * Using the fb_var_screeninfo in fb_info we set the resolution of this
 * particular framebuffer. This function alters the fb_fix_screeninfo stored
 * in fb_info. It does not alter var in fb_info since we are using that
 * data. This means we depend on the data in var inside fb_info to be
 * supported by the hardware. fsl_diu_check_var is always called before
 * fsl_diu_set_par to ensure this.
 */
static int fsl_diu_set_par(struct fb_info *info)
{
        unsigned long len;
        struct fb_var_screeninfo *var = &info->var;
        struct mfb_info *mfbi = info->par;
        struct fsl_diu_data *data = mfbi->parent;
        struct diu_ad *ad = mfbi->ad;
        struct diu __iomem *hw;

        hw = data->diu_reg;

        set_fix(info);

        len = info->var.yres_virtual * info->fix.line_length;
        /* Alloc & dealloc each time resolution/bpp change */
        if (len != info->fix.smem_len) {
                if (info->fix.smem_start)
                        unmap_video_memory(info);

                /* Memory allocation for framebuffer */
                if (map_video_memory(info)) {
                        dev_err(info->dev, "unable to allocate fb memory 1\n");
                        return -ENOMEM;
                }
        }

        if (diu_ops.get_pixel_format)
                ad->pix_fmt = diu_ops.get_pixel_format(data->monitor_port,
                                                       var->bits_per_pixel);
        else
                ad->pix_fmt = fsl_diu_get_pixel_format(var->bits_per_pixel);

        ad->addr    = cpu_to_le32(info->fix.smem_start);
        ad->src_size_g_alpha = cpu_to_le32((var->yres_virtual << 12) |
                                var->xres_virtual) | mfbi->g_alpha;
        /* AOI should not be greater than display size */
        ad->aoi_size    = cpu_to_le32((var->yres << 16) | var->xres);
        ad->offset_xyi = cpu_to_le32((var->yoffset << 16) | var->xoffset);
        ad->offset_xyd = cpu_to_le32((mfbi->y_aoi_d << 16) | mfbi->x_aoi_d);

        /* Disable chroma keying function */
        ad->ckmax_r = 0;
        ad->ckmax_g = 0;
        ad->ckmax_b = 0;

        ad->ckmin_r = 255;
        ad->ckmin_g = 255;
        ad->ckmin_b = 255;

        if (mfbi->index == PLANE0)
                update_lcdc(info);
        return 0;
}

static inline __u32 CNVT_TOHW(__u32 val, __u32 width)
{
        return ((val << width) + 0x7FFF - val) >> 16;
}

/*
 * Set a single color register. The values supplied have a 16 bit magnitude
 * which needs to be scaled in this function for the hardware. Things to take
 * into consideration are how many color registers, if any, are supported with
 * the current color visual. With truecolor mode no color palettes are
 * supported. Here a pseudo palette is created which we store the value in
 * pseudo_palette in struct fb_info. For pseudocolor mode we have a limited
 * color palette.
 */
static int fsl_diu_setcolreg(unsigned int regno, unsigned int red,
                             unsigned int green, unsigned int blue,
                             unsigned int transp, struct fb_info *info)
{
        int ret = 1;

        /*
         * If greyscale is true, then we convert the RGB value
         * to greyscale no matter what visual we are using.
         */
        if (info->var.grayscale)
                red = green = blue = (19595 * red + 38470 * green +
                                      7471 * blue) >> 16;
        switch (info->fix.visual) {
        case FB_VISUAL_TRUECOLOR:
                /*
                 * 16-bit True Colour.  We encode the RGB value
                 * according to the RGB bitfield information.
                 */
                if (regno < 16) {
                        u32 *pal = info->pseudo_palette;
                        u32 v;

                        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);

                        v = (red << info->var.red.offset) |
                            (green << info->var.green.offset) |
                            (blue << info->var.blue.offset) |
                            (transp << info->var.transp.offset);

                        pal[regno] = v;
                        ret = 0;
                }
                break;
        }

        return ret;
}

/*
 * Pan (or wrap, depending on the `vmode' field) the display using the
 * 'xoffset' and 'yoffset' fields of the 'var' structure. If the values
 * don't fit, return -EINVAL.
 */
static int fsl_diu_pan_display(struct fb_var_screeninfo *var,
                             struct fb_info *info)
{
        if ((info->var.xoffset == var->xoffset) &&
            (info->var.yoffset == var->yoffset))
                return 0;       /* No change, do nothing */

        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;

        fsl_diu_set_aoi(info);

        return 0;
}

static int fsl_diu_ioctl(struct fb_info *info, unsigned int cmd,
                       unsigned long arg)
{
        struct mfb_info *mfbi = info->par;
        struct diu_ad *ad = mfbi->ad;
        struct mfb_chroma_key ck;
        unsigned char global_alpha;
        struct aoi_display_offset aoi_d;
        __u32 pix_fmt;
        void __user *buf = (void __user *)arg;

        if (!arg)
                return -EINVAL;

        dev_dbg(info->dev, "ioctl %08x (dir=%s%s type=%u nr=%u size=%u)\n", cmd,
                _IOC_DIR(cmd) & _IOC_READ ? "R" : "",
                _IOC_DIR(cmd) & _IOC_WRITE ? "W" : "",
                _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd));

        switch (cmd) {
        case MFB_SET_PIXFMT_OLD:
                dev_warn(info->dev,
                         "MFB_SET_PIXFMT value of 0x%08x is deprecated.\n",
                         MFB_SET_PIXFMT_OLD);
        case MFB_SET_PIXFMT:
                if (copy_from_user(&pix_fmt, buf, sizeof(pix_fmt)))
                        return -EFAULT;
                ad->pix_fmt = pix_fmt;
                break;
        case MFB_GET_PIXFMT_OLD:
                dev_warn(info->dev,
                         "MFB_GET_PIXFMT value of 0x%08x is deprecated.\n",
                         MFB_GET_PIXFMT_OLD);
        case MFB_GET_PIXFMT:
                pix_fmt = ad->pix_fmt;
                if (copy_to_user(buf, &pix_fmt, sizeof(pix_fmt)))
                        return -EFAULT;
                break;
        case MFB_SET_AOID:
                if (copy_from_user(&aoi_d, buf, sizeof(aoi_d)))
                        return -EFAULT;
                mfbi->x_aoi_d = aoi_d.x_aoi_d;
                mfbi->y_aoi_d = aoi_d.y_aoi_d;
                fsl_diu_check_var(&info->var, info);
                fsl_diu_set_aoi(info);
                break;
        case MFB_GET_AOID:
                aoi_d.x_aoi_d = mfbi->x_aoi_d;
                aoi_d.y_aoi_d = mfbi->y_aoi_d;
                if (copy_to_user(buf, &aoi_d, sizeof(aoi_d)))
                        return -EFAULT;
                break;
        case MFB_GET_ALPHA:
                global_alpha = mfbi->g_alpha;
                if (copy_to_user(buf, &global_alpha, sizeof(global_alpha)))
                        return -EFAULT;
                break;
        case MFB_SET_ALPHA:
                /* set panel information */
                if (copy_from_user(&global_alpha, buf, sizeof(global_alpha)))
                        return -EFAULT;
                ad->src_size_g_alpha = (ad->src_size_g_alpha & (~0xff)) |
                                                        (global_alpha & 0xff);
                mfbi->g_alpha = global_alpha;
                break;
        case MFB_SET_CHROMA_KEY:
                /* set panel winformation */
                if (copy_from_user(&ck, buf, sizeof(ck)))
                        return -EFAULT;

                if (ck.enable &&
                   (ck.red_max < ck.red_min ||
                    ck.green_max < ck.green_min ||
                    ck.blue_max < ck.blue_min))
                        return -EINVAL;

                if (!ck.enable) {
                        ad->ckmax_r = 0;
                        ad->ckmax_g = 0;
                        ad->ckmax_b = 0;
                        ad->ckmin_r = 255;
                        ad->ckmin_g = 255;
                        ad->ckmin_b = 255;
                } else {
                        ad->ckmax_r = ck.red_max;
                        ad->ckmax_g = ck.green_max;
                        ad->ckmax_b = ck.blue_max;
                        ad->ckmin_r = ck.red_min;
                        ad->ckmin_g = ck.green_min;
                        ad->ckmin_b = ck.blue_min;
                }
                break;
#ifdef CONFIG_PPC_MPC512x
        case MFB_SET_GAMMA: {
                struct fsl_diu_data *data = mfbi->parent;

                if (copy_from_user(data->gamma, buf, sizeof(data->gamma)))
                        return -EFAULT;
                setbits32(&data->diu_reg->gamma, 0); /* Force table reload */
                break;
        }
        case MFB_GET_GAMMA: {
                struct fsl_diu_data *data = mfbi->parent;

                if (copy_to_user(buf, data->gamma, sizeof(data->gamma)))
                        return -EFAULT;
                break;
        }
#endif
        default:
                dev_err(info->dev, "unknown ioctl command (0x%08X)\n", cmd);
                return -ENOIOCTLCMD;
        }

        return 0;
}

static inline void fsl_diu_enable_interrupts(struct fsl_diu_data *data)
{
        u32 int_mask = INT_UNDRUN; /* enable underrun detection */

        if (IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
                int_mask |= INT_VSYNC; /* enable vertical sync */

        clrbits32(&data->diu_reg->int_mask, int_mask);
}

/* turn on fb if count == 1
 */
static int fsl_diu_open(struct fb_info *info, int user)
{
        struct mfb_info *mfbi = info->par;
        int res = 0;

        /* free boot splash memory on first /dev/fb0 open */
        if ((mfbi->index == PLANE0) && diu_ops.release_bootmem)
                diu_ops.release_bootmem();

        spin_lock(&diu_lock);
        mfbi->count++;
        if (mfbi->count == 1) {
                fsl_diu_check_var(&info->var, info);
                res = fsl_diu_set_par(info);
                if (res < 0)
                        mfbi->count--;
                else {
                        fsl_diu_enable_interrupts(mfbi->parent);
                        fsl_diu_enable_panel(info);
                }
        }

        spin_unlock(&diu_lock);
        return res;
}

/* turn off fb if count == 0
 */
static int fsl_diu_release(struct fb_info *info, int user)
{
        struct mfb_info *mfbi = info->par;
        int res = 0;

        spin_lock(&diu_lock);
        mfbi->count--;
        if (mfbi->count == 0) {
                struct fsl_diu_data *data = mfbi->parent;
                bool disable = true;
                int i;

                /* Disable interrupts only if all AOIs are closed */
                for (i = 0; i < NUM_AOIS; i++) {
                        struct mfb_info *mi = data->fsl_diu_info[i].par;

                        if (mi->count)
                                disable = false;
                }
                if (disable)
                        out_be32(&data->diu_reg->int_mask, 0xffffffff);
                fsl_diu_disable_panel(info);
        }

        spin_unlock(&diu_lock);
        return res;
}

static struct fb_ops fsl_diu_ops = {
        .owner = THIS_MODULE,
        .fb_check_var = fsl_diu_check_var,
        .fb_set_par = fsl_diu_set_par,
        .fb_setcolreg = fsl_diu_setcolreg,
        .fb_pan_display = fsl_diu_pan_display,
        .fb_fillrect = cfb_fillrect,
        .fb_copyarea = cfb_copyarea,
        .fb_imageblit = cfb_imageblit,
        .fb_ioctl = fsl_diu_ioctl,
        .fb_open = fsl_diu_open,
        .fb_release = fsl_diu_release,
        .fb_cursor = fsl_diu_cursor,
};

static int install_fb(struct fb_info *info)
{
        int rc;
        struct mfb_info *mfbi = info->par;
        struct fsl_diu_data *data = mfbi->parent;
        const char *aoi_mode, *init_aoi_mode = "320x240";
        struct fb_videomode *db = fsl_diu_mode_db;
        unsigned int dbsize = ARRAY_SIZE(fsl_diu_mode_db);
        int has_default_mode = 1;

        info->var.activate = FB_ACTIVATE_NOW;
        info->fbops = &fsl_diu_ops;
        info->flags = FBINFO_DEFAULT | FBINFO_VIRTFB | FBINFO_PARTIAL_PAN_OK |
                FBINFO_READS_FAST;
        info->pseudo_palette = mfbi->pseudo_palette;

        rc = fb_alloc_cmap(&info->cmap, 16, 0);
        if (rc)
                return rc;

        if (mfbi->index == PLANE0) {
                if (data->has_edid) {
                        /* Now build modedb from EDID */
                        fb_edid_to_monspecs(data->edid_data, &info->monspecs);
                        fb_videomode_to_modelist(info->monspecs.modedb,
                                                 info->monspecs.modedb_len,
                                                 &info->modelist);
                        db = info->monspecs.modedb;
                        dbsize = info->monspecs.modedb_len;
                }
                aoi_mode = fb_mode;
        } else {
                aoi_mode = init_aoi_mode;
        }
        rc = fb_find_mode(&info->var, info, aoi_mode, db, dbsize, NULL,
                          default_bpp);
        if (!rc) {
                /*
                 * For plane 0 we continue and look into
                 * driver's internal modedb.
                 */
                if ((mfbi->index == PLANE0) && data->has_edid)
                        has_default_mode = 0;
                else
                        return -EINVAL;
        }

        if (!has_default_mode) {
                rc = fb_find_mode(&info->var, info, aoi_mode, fsl_diu_mode_db,
                        ARRAY_SIZE(fsl_diu_mode_db), NULL, default_bpp);
                if (rc)
                        has_default_mode = 1;
        }

        /* Still not found, use preferred mode from database if any */
        if (!has_default_mode && info->monspecs.modedb) {
                struct fb_monspecs *specs = &info->monspecs;
                struct fb_videomode *modedb = &specs->modedb[0];

                /*
                 * Get preferred timing. If not found,
                 * first mode in database will be used.
                 */
                if (specs->misc & FB_MISC_1ST_DETAIL) {
                        int i;

                        for (i = 0; i < specs->modedb_len; i++) {
                                if (specs->modedb[i].flag & FB_MODE_IS_FIRST) {
                                        modedb = &specs->modedb[i];
                                        break;
                                }
                        }
                }

                info->var.bits_per_pixel = default_bpp;
                fb_videomode_to_var(&info->var, modedb);
        }

        if (fsl_diu_check_var(&info->var, info)) {
                dev_err(info->dev, "fsl_diu_check_var failed\n");
                unmap_video_memory(info);
                fb_dealloc_cmap(&info->cmap);
                return -EINVAL;
        }

        if (register_framebuffer(info) < 0) {
                dev_err(info->dev, "register_framebuffer failed\n");
                unmap_video_memory(info);
                fb_dealloc_cmap(&info->cmap);
                return -EINVAL;
        }

        mfbi->registered = 1;
        dev_info(info->dev, "%s registered successfully\n", mfbi->id);

        return 0;
}

static void uninstall_fb(struct fb_info *info)
{
        struct mfb_info *mfbi = info->par;

        if (!mfbi->registered)
                return;

        unregister_framebuffer(info);
        unmap_video_memory(info);
        if (&info->cmap)
                fb_dealloc_cmap(&info->cmap);

        mfbi->registered = 0;
}

static irqreturn_t fsl_diu_isr(int irq, void *dev_id)
{
        struct diu __iomem *hw = dev_id;
        uint32_t status = in_be32(&hw->int_status);

        if (status) {
                /* This is the workaround for underrun */
                if (status & INT_UNDRUN) {
                        out_be32(&hw->diu_mode, 0);
                        udelay(1);
                        out_be32(&hw->diu_mode, 1);
                }
#if defined(CONFIG_NOT_COHERENT_CACHE)
                else if (status & INT_VSYNC) {
                        unsigned int i;

                        for (i = 0; i < coherence_data_size;
                                i += d_cache_line_size)
                                __asm__ __volatile__ (
                                        "dcbz 0, %[input]"
                                ::[input]"r"(&coherence_data[i]));
                }
#endif
                return IRQ_HANDLED;
        }
        return IRQ_NONE;
}

#ifdef CONFIG_PM
/*
 * Power management hooks. Note that we won't be called from IRQ context,
 * unlike the blank functions above, so we may sleep.
 */
static int fsl_diu_suspend(struct platform_device *ofdev, pm_message_t state)
{
        struct fsl_diu_data *data;

        data = dev_get_drvdata(&ofdev->dev);
        disable_lcdc(data->fsl_diu_info);

        return 0;
}

static int fsl_diu_resume(struct platform_device *ofdev)
{
        struct fsl_diu_data *data;
        unsigned int i;

        data = dev_get_drvdata(&ofdev->dev);

        fsl_diu_enable_interrupts(data);
        update_lcdc(data->fsl_diu_info);
        for (i = 0; i < NUM_AOIS; i++) {
                if (data->mfb[i].count)
                        fsl_diu_enable_panel(&data->fsl_diu_info[i]);
        }

        return 0;
}

#else
#define fsl_diu_suspend NULL
#define fsl_diu_resume NULL
#endif                          /* CONFIG_PM */

static ssize_t store_monitor(struct device *device,
        struct device_attribute *attr, const char *buf, size_t count)
{
        enum fsl_diu_monitor_port old_monitor_port;
        struct fsl_diu_data *data =
                container_of(attr, struct fsl_diu_data, dev_attr);

        old_monitor_port = data->monitor_port;
        data->monitor_port = fsl_diu_name_to_port(buf);

        if (old_monitor_port != data->monitor_port) {
                /* All AOIs need adjust pixel format
                 * fsl_diu_set_par only change the pixsel format here
                 * unlikely to fail. */
                unsigned int i;

                for (i=0; i < NUM_AOIS; i++)
                        fsl_diu_set_par(&data->fsl_diu_info[i]);
        }
        return count;
}

static ssize_t show_monitor(struct device *device,
        struct device_attribute *attr, char *buf)
{
        struct fsl_diu_data *data =
                container_of(attr, struct fsl_diu_data, dev_attr);

        switch (data->monitor_port) {
        case FSL_DIU_PORT_DVI:
                return sprintf(buf, "DVI\n");
        case FSL_DIU_PORT_LVDS:
                return sprintf(buf, "Single-link LVDS\n");
        case FSL_DIU_PORT_DLVDS:
                return sprintf(buf, "Dual-link LVDS\n");
        }

        return 0;
}

static int fsl_diu_probe(struct platform_device *pdev)
{
        struct device_node *np = pdev->dev.of_node;
        struct mfb_info *mfbi;
        struct fsl_diu_data *data;
        dma_addr_t dma_addr; /* DMA addr of fsl_diu_data struct */
        const void *prop;
        unsigned int i;
        int ret;

        data = dmam_alloc_coherent(&pdev->dev, sizeof(struct fsl_diu_data),
                                   &dma_addr, GFP_DMA | __GFP_ZERO);
        if (!data)
                return -ENOMEM;
        data->dma_addr = dma_addr;

        /*
         * dma_alloc_coherent() uses a page allocator, so the address is
         * always page-aligned.  We need the memory to be 32-byte aligned,
         * so that's good.  However, if one day the allocator changes, we
         * need to catch that.  It's not worth the effort to handle unaligned
         * alloctions now because it's highly unlikely to ever be a problem.
         */
        if ((unsigned long)data & 31) {
                dev_err(&pdev->dev, "misaligned allocation");
                ret = -ENOMEM;
                goto error;
        }

        spin_lock_init(&data->reg_lock);

        for (i = 0; i < NUM_AOIS; i++) {
                struct fb_info *info = &data->fsl_diu_info[i];

                info->device = &pdev->dev;
                info->par = &data->mfb[i];

                /*
                 * We store the physical address of the AD in the reserved
                 * 'paddr' field of the AD itself.
                 */
                data->ad[i].paddr = DMA_ADDR(data, ad[i]);

                info->fix.smem_start = 0;

                /* Initialize the AOI data structure */
                mfbi = info->par;
                memcpy(mfbi, &mfb_template[i], sizeof(struct mfb_info));
                mfbi->parent = data;
                mfbi->ad = &data->ad[i];
        }

        /* Get the EDID data from the device tree, if present */
        prop = of_get_property(np, "edid", &ret);
        if (prop && ret == EDID_LENGTH) {
                memcpy(data->edid_data, prop, EDID_LENGTH);
                data->has_edid = true;
        }

        data->diu_reg = of_iomap(np, 0);
        if (!data->diu_reg) {
                dev_err(&pdev->dev, "cannot map DIU registers\n");
                ret = -EFAULT;
                goto error;
        }

        /* Get the IRQ of the DIU */
        data->irq = irq_of_parse_and_map(np, 0);

        if (!data->irq) {
                dev_err(&pdev->dev, "could not get DIU IRQ\n");
                ret = -EINVAL;
                goto error;
        }
        data->monitor_port = monitor_port;

        /* Initialize the dummy Area Descriptor */
        data->dummy_ad.addr = cpu_to_le32(DMA_ADDR(data, dummy_aoi));
        data->dummy_ad.pix_fmt = 0x88882317;
        data->dummy_ad.src_size_g_alpha = cpu_to_le32((4 << 12) | 4);
        data->dummy_ad.aoi_size = cpu_to_le32((4 << 16) |  2);
        data->dummy_ad.offset_xyi = 0;
        data->dummy_ad.offset_xyd = 0;
        data->dummy_ad.next_ad = 0;
        data->dummy_ad.paddr = DMA_ADDR(data, dummy_ad);

        /*
         * Let DIU continue to display splash screen if it was pre-initialized
         * by the bootloader; otherwise, clear the display.
         */
        if (in_be32(&data->diu_reg->diu_mode) == MFB_MODE0)
                out_be32(&data->diu_reg->desc[0], 0);

        out_be32(&data->diu_reg->desc[1], data->dummy_ad.paddr);
        out_be32(&data->diu_reg->desc[2], data->dummy_ad.paddr);

        /*
         * Older versions of U-Boot leave interrupts enabled, so disable
         * all of them and clear the status register.
         */
        out_be32(&data->diu_reg->int_mask, 0xffffffff);
        in_be32(&data->diu_reg->int_status);

        ret = request_irq(data->irq, fsl_diu_isr, 0, "fsl-diu-fb",
                          data->diu_reg);
        if (ret) {
                dev_err(&pdev->dev, "could not claim irq\n");
                goto error;
        }

        for (i = 0; i < NUM_AOIS; i++) {
                ret = install_fb(&data->fsl_diu_info[i]);
                if (ret) {
                        dev_err(&pdev->dev, "could not register fb %d\n", i);
                        free_irq(data->irq, data->diu_reg);
                        goto error;
                }
        }

        sysfs_attr_init(&data->dev_attr.attr);
        data->dev_attr.attr.name = "monitor";
        data->dev_attr.attr.mode = S_IRUGO|S_IWUSR;
        data->dev_attr.show = show_monitor;
        data->dev_attr.store = store_monitor;
        ret = device_create_file(&pdev->dev, &data->dev_attr);
        if (ret) {
                dev_err(&pdev->dev, "could not create sysfs file %s\n",
                        data->dev_attr.attr.name);
        }

        dev_set_drvdata(&pdev->dev, data);
        return 0;

error:
        for (i = 0; i < NUM_AOIS; i++)
                uninstall_fb(&data->fsl_diu_info[i]);

        iounmap(data->diu_reg);

        return ret;
}

static int fsl_diu_remove(struct platform_device *pdev)
{
        struct fsl_diu_data *data;
        int i;

        data = dev_get_drvdata(&pdev->dev);
        disable_lcdc(&data->fsl_diu_info[0]);

        free_irq(data->irq, data->diu_reg);

        for (i = 0; i < NUM_AOIS; i++)
                uninstall_fb(&data->fsl_diu_info[i]);

        iounmap(data->diu_reg);

        return 0;
}

#ifndef MODULE
static int __init fsl_diu_setup(char *options)
{
        char *opt;
        unsigned long val;

        if (!options || !*options)
                return 0;

        while ((opt = strsep(&options, ",")) != NULL) {
                if (!*opt)
                        continue;
                if (!strncmp(opt, "monitor=", 8)) {
                        monitor_port = fsl_diu_name_to_port(opt + 8);
                } else if (!strncmp(opt, "bpp=", 4)) {
                        if (!kstrtoul(opt + 4, 10, &val))
                                default_bpp = val;
                } else
                        fb_mode = opt;
        }

        return 0;
}
#endif

static const struct of_device_id fsl_diu_match[] = {
#ifdef CONFIG_PPC_MPC512x
        {
                .compatible = "fsl,mpc5121-diu",
        },
#endif
        {
                .compatible = "fsl,diu",
        },
        {}
};
MODULE_DEVICE_TABLE(of, fsl_diu_match);

static struct platform_driver fsl_diu_driver = {
        .driver = {
                .name = "fsl-diu-fb",
                .of_match_table = fsl_diu_match,
        },
        .probe          = fsl_diu_probe,
        .remove         = fsl_diu_remove,
        .suspend        = fsl_diu_suspend,
        .resume         = fsl_diu_resume,
};

static int __init fsl_diu_init(void)
{
#ifdef CONFIG_NOT_COHERENT_CACHE
        struct device_node *np;
        const u32 *prop;
#endif
        int ret;
#ifndef MODULE
        char *option;

        /*
         * For kernel boot options (in 'video=xxxfb:<options>' format)
         */
        if (fb_get_options("fslfb", &option))
                return -ENODEV;
        fsl_diu_setup(option);
#else
        monitor_port = fsl_diu_name_to_port(monitor_string);
#endif

        /*
         * Must to verify set_pixel_clock. If not implement on platform,
         * then that means that there is no platform support for the DIU.
         */
        if (!diu_ops.set_pixel_clock)
                return -ENODEV;

        pr_info("Freescale Display Interface Unit (DIU) framebuffer driver\n");

#ifdef CONFIG_NOT_COHERENT_CACHE
        np = of_find_node_by_type(NULL, "cpu");
        if (!np) {
                pr_err("fsl-diu-fb: can't find 'cpu' device node\n");
                return -ENODEV;
        }

        prop = of_get_property(np, "d-cache-size", NULL);
        if (prop == NULL) {
                pr_err("fsl-diu-fb: missing 'd-cache-size' property' "
                       "in 'cpu' node\n");
                of_node_put(np);
                return -ENODEV;
        }

        /*
         * Freescale PLRU requires 13/8 times the cache size to do a proper
         * displacement flush
         */
        coherence_data_size = be32_to_cpup(prop) * 13;
        coherence_data_size /= 8;

        pr_debug("fsl-diu-fb: coherence data size is %zu bytes\n",
                 coherence_data_size);

        prop = of_get_property(np, "d-cache-line-size", NULL);
        if (prop == NULL) {
                pr_err("fsl-diu-fb: missing 'd-cache-line-size' property' "
                       "in 'cpu' node\n");
                of_node_put(np);
                return -ENODEV;
        }
        d_cache_line_size = be32_to_cpup(prop);

        pr_debug("fsl-diu-fb: cache lines size is %u bytes\n",
                 d_cache_line_size);

        of_node_put(np);
        coherence_data = vmalloc(coherence_data_size);
        if (!coherence_data)
                return -ENOMEM;
#endif

        ret = platform_driver_register(&fsl_diu_driver);
        if (ret) {
                pr_err("fsl-diu-fb: failed to register platform driver\n");
#if defined(CONFIG_NOT_COHERENT_CACHE)
                vfree(coherence_data);
#endif
        }
        return ret;
}

static void __exit fsl_diu_exit(void)
{
        platform_driver_unregister(&fsl_diu_driver);
#if defined(CONFIG_NOT_COHERENT_CACHE)
        vfree(coherence_data);
#endif
}

module_init(fsl_diu_init);
module_exit(fsl_diu_exit);

MODULE_AUTHOR("York Sun <yorksun@freescale.com>");
MODULE_DESCRIPTION("Freescale DIU framebuffer driver");
MODULE_LICENSE("GPL");

module_param_named(mode, fb_mode, charp, 0);
MODULE_PARM_DESC(mode,
        "Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\" ");
module_param_named(bpp, default_bpp, ulong, 0);
MODULE_PARM_DESC(bpp, "Specify bit-per-pixel if not specified in 'mode'");
module_param_named(monitor, monitor_string, charp, 0);
MODULE_PARM_DESC(monitor, "Specify the monitor port "
        "(\"dvi\", \"lvds\", or \"dlvds\") if supported by the platform");