Linux 2.6.17.7

[linux/fpc-iii.git] / drivers / video / pxafb.c

/*
 *  linux/drivers/video/pxafb.c
 *
 *  Copyright (C) 1999 Eric A. Thomas.
 *  Copyright (C) 2004 Jean-Frederic Clere.
 *  Copyright (C) 2004 Ian Campbell.
 *  Copyright (C) 2004 Jeff Lackey.
 *   Based on sa1100fb.c Copyright (C) 1999 Eric A. Thomas
 *  which in turn is
 *   Based on acornfb.c Copyright (C) Russell King.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive for
 * more details.
 *
 *              Intel PXA250/210 LCD Controller Frame Buffer Driver
 *
 * Please direct your questions and comments on this driver to the following
 * email address:
 *
 *      linux-arm-kernel@lists.arm.linux.org.uk
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/cpufreq.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>

#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/div64.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/bitfield.h>
#include <asm/arch/pxafb.h>

/*
 * Complain if VAR is out of range.
 */
#define DEBUG_VAR 1

#include "pxafb.h"

/* Bits which should not be set in machine configuration structures */
#define LCCR0_INVALID_CONFIG_MASK (LCCR0_OUM|LCCR0_BM|LCCR0_QDM|LCCR0_DIS|LCCR0_EFM|LCCR0_IUM|LCCR0_SFM|LCCR0_LDM|LCCR0_ENB)
#define LCCR3_INVALID_CONFIG_MASK (LCCR3_HSP|LCCR3_VSP|LCCR3_PCD|LCCR3_BPP)

static void (*pxafb_backlight_power)(int);
static void (*pxafb_lcd_power)(int);

static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *);
static void set_ctrlr_state(struct pxafb_info *fbi, u_int state);

#ifdef CONFIG_FB_PXA_PARAMETERS
#define PXAFB_OPTIONS_SIZE 256
static char g_options[PXAFB_OPTIONS_SIZE] __initdata = "";
#endif

static inline void pxafb_schedule_work(struct pxafb_info *fbi, u_int state)
{
        unsigned long flags;

        local_irq_save(flags);
        /*
         * We need to handle two requests being made at the same time.
         * There are two important cases:
         *  1. When we are changing VT (C_REENABLE) while unblanking (C_ENABLE)
         *     We must perform the unblanking, which will do our REENABLE for us.
         *  2. When we are blanking, but immediately unblank before we have
         *     blanked.  We do the "REENABLE" thing here as well, just to be sure.
         */
        if (fbi->task_state == C_ENABLE && state == C_REENABLE)
                state = (u_int) -1;
        if (fbi->task_state == C_DISABLE && state == C_ENABLE)
                state = C_REENABLE;

        if (state != (u_int)-1) {
                fbi->task_state = state;
                schedule_work(&fbi->task);
        }
        local_irq_restore(flags);
}

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

static int
pxafb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
                       u_int trans, struct fb_info *info)
{
        struct pxafb_info *fbi = (struct pxafb_info *)info;
        u_int val, ret = 1;

        if (regno < fbi->palette_size) {
                if (fbi->fb.var.grayscale) {
                        val = ((blue >> 8) & 0x00ff);
                } else {
                        val  = ((red   >>  0) & 0xf800);
                        val |= ((green >>  5) & 0x07e0);
                        val |= ((blue  >> 11) & 0x001f);
                }
                fbi->palette_cpu[regno] = val;
                ret = 0;
        }
        return ret;
}

static int
pxafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                   u_int trans, struct fb_info *info)
{
        struct pxafb_info *fbi = (struct pxafb_info *)info;
        unsigned int val;
        int ret = 1;

        /*
         * If inverse mode was selected, invert all the colours
         * rather than the register number.  The register number
         * is what you poke into the framebuffer to produce the
         * colour you requested.
         */
        if (fbi->cmap_inverse) {
                red   = 0xffff - red;
                green = 0xffff - green;
                blue  = 0xffff - blue;
        }

        /*
         * If greyscale is true, then we convert the RGB value
         * to greyscale no matter what visual we are using.
         */
        if (fbi->fb.var.grayscale)
                red = green = blue = (19595 * red + 38470 * green +
                                        7471 * blue) >> 16;

        switch (fbi->fb.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 = fbi->fb.pseudo_palette;

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

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

        case FB_VISUAL_STATIC_PSEUDOCOLOR:
        case FB_VISUAL_PSEUDOCOLOR:
                ret = pxafb_setpalettereg(regno, red, green, blue, trans, info);
                break;
        }

        return ret;
}

/*
 *  pxafb_bpp_to_lccr3():
 *    Convert a bits per pixel value to the correct bit pattern for LCCR3
 */
static int pxafb_bpp_to_lccr3(struct fb_var_screeninfo *var)
{
        int ret = 0;
        switch (var->bits_per_pixel) {
        case 1:  ret = LCCR3_1BPP; break;
        case 2:  ret = LCCR3_2BPP; break;
        case 4:  ret = LCCR3_4BPP; break;
        case 8:  ret = LCCR3_8BPP; break;
        case 16: ret = LCCR3_16BPP; break;
        }
        return ret;
}

#ifdef CONFIG_CPU_FREQ
/*
 *  pxafb_display_dma_period()
 *    Calculate the minimum period (in picoseconds) between two DMA
 *    requests for the LCD controller.  If we hit this, it means we're
 *    doing nothing but LCD DMA.
 */
static unsigned int pxafb_display_dma_period(struct fb_var_screeninfo *var)
{
       /*
        * Period = pixclock * bits_per_byte * bytes_per_transfer
        *              / memory_bits_per_pixel;
        */
       return var->pixclock * 8 * 16 / var->bits_per_pixel;
}

extern unsigned int get_clk_frequency_khz(int info);
#endif

/*
 *  pxafb_check_var():
 *    Get the video params out of 'var'. If a value doesn't fit, round it up,
 *    if it's too big, return -EINVAL.
 *
 *    Round up in the following order: bits_per_pixel, xres,
 *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 *    bitfields, horizontal timing, vertical timing.
 */
static int pxafb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
        struct pxafb_info *fbi = (struct pxafb_info *)info;

        if (var->xres < MIN_XRES)
                var->xres = MIN_XRES;
        if (var->yres < MIN_YRES)
                var->yres = MIN_YRES;
        if (var->xres > fbi->max_xres)
                return -EINVAL;
        if (var->yres > fbi->max_yres)
                return -EINVAL;
        var->xres_virtual =
                max(var->xres_virtual, var->xres);
        var->yres_virtual =
                max(var->yres_virtual, var->yres);

        /*
         * Setup the RGB parameters for this display.
         *
         * The pixel packing format is described on page 7-11 of the
         * PXA2XX Developer's Manual.
         */
        if (var->bits_per_pixel == 16) {
                var->red.offset   = 11; var->red.length   = 5;
                var->green.offset = 5;  var->green.length = 6;
                var->blue.offset  = 0;  var->blue.length  = 5;
                var->transp.offset = var->transp.length = 0;
        } else {
                var->red.offset = var->green.offset = var->blue.offset = var->transp.offset = 0;
                var->red.length   = 8;
                var->green.length = 8;
                var->blue.length  = 8;
                var->transp.length = 0;
        }

#ifdef CONFIG_CPU_FREQ
        pr_debug("pxafb: dma period = %d ps, clock = %d kHz\n",
                 pxafb_display_dma_period(var),
                 get_clk_frequency_khz(0));
#endif

        return 0;
}

static inline void pxafb_set_truecolor(u_int is_true_color)
{
        pr_debug("pxafb: true_color = %d\n", is_true_color);
        // do your machine-specific setup if needed
}

/*
 * pxafb_set_par():
 *      Set the user defined part of the display for the specified console
 */
static int pxafb_set_par(struct fb_info *info)
{
        struct pxafb_info *fbi = (struct pxafb_info *)info;
        struct fb_var_screeninfo *var = &info->var;
        unsigned long palette_mem_size;

        pr_debug("pxafb: set_par\n");

        if (var->bits_per_pixel == 16)
                fbi->fb.fix.visual = FB_VISUAL_TRUECOLOR;
        else if (!fbi->cmap_static)
                fbi->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
        else {
                /*
                 * Some people have weird ideas about wanting static
                 * pseudocolor maps.  I suspect their user space
                 * applications are broken.
                 */
                fbi->fb.fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
        }

        fbi->fb.fix.line_length = var->xres_virtual *
                                  var->bits_per_pixel / 8;
        if (var->bits_per_pixel == 16)
                fbi->palette_size = 0;
        else
                fbi->palette_size = var->bits_per_pixel == 1 ? 4 : 1 << var->bits_per_pixel;

        palette_mem_size = fbi->palette_size * sizeof(u16);

        pr_debug("pxafb: palette_mem_size = 0x%08lx\n", palette_mem_size);

        fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
        fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;

        /*
         * Set (any) board control register to handle new color depth
         */
        pxafb_set_truecolor(fbi->fb.fix.visual == FB_VISUAL_TRUECOLOR);

        if (fbi->fb.var.bits_per_pixel == 16)
                fb_dealloc_cmap(&fbi->fb.cmap);
        else
                fb_alloc_cmap(&fbi->fb.cmap, 1<<fbi->fb.var.bits_per_pixel, 0);

        pxafb_activate_var(var, fbi);

        return 0;
}

/*
 * Formal definition of the VESA spec:
 *  On
 *      This refers to the state of the display when it is in full operation
 *  Stand-By
 *      This defines an optional operating state of minimal power reduction with
 *      the shortest recovery time
 *  Suspend
 *      This refers to a level of power management in which substantial power
 *      reduction is achieved by the display.  The display can have a longer
 *      recovery time from this state than from the Stand-by state
 *  Off
 *      This indicates that the display is consuming the lowest level of power
 *      and is non-operational. Recovery from this state may optionally require
 *      the user to manually power on the monitor
 *
 *  Now, the fbdev driver adds an additional state, (blank), where they
 *  turn off the video (maybe by colormap tricks), but don't mess with the
 *  video itself: think of it semantically between on and Stand-By.
 *
 *  So here's what we should do in our fbdev blank routine:
 *
 *      VESA_NO_BLANKING (mode 0)       Video on,  front/back light on
 *      VESA_VSYNC_SUSPEND (mode 1)     Video on,  front/back light off
 *      VESA_HSYNC_SUSPEND (mode 2)     Video on,  front/back light off
 *      VESA_POWERDOWN (mode 3)         Video off, front/back light off
 *
 *  This will match the matrox implementation.
 */

/*
 * pxafb_blank():
 *      Blank the display by setting all palette values to zero.  Note, the
 *      16 bpp mode does not really use the palette, so this will not
 *      blank the display in all modes.
 */
static int pxafb_blank(int blank, struct fb_info *info)
{
        struct pxafb_info *fbi = (struct pxafb_info *)info;
        int i;

        pr_debug("pxafb: blank=%d\n", blank);

        switch (blank) {
        case FB_BLANK_POWERDOWN:
        case FB_BLANK_VSYNC_SUSPEND:
        case FB_BLANK_HSYNC_SUSPEND:
        case FB_BLANK_NORMAL:
                if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
                    fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
                        for (i = 0; i < fbi->palette_size; i++)
                                pxafb_setpalettereg(i, 0, 0, 0, 0, info);

                pxafb_schedule_work(fbi, C_DISABLE);
                //TODO if (pxafb_blank_helper) pxafb_blank_helper(blank);
                break;

        case FB_BLANK_UNBLANK:
                //TODO if (pxafb_blank_helper) pxafb_blank_helper(blank);
                if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
                    fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
                        fb_set_cmap(&fbi->fb.cmap, info);
                pxafb_schedule_work(fbi, C_ENABLE);
        }
        return 0;
}

static int pxafb_mmap(struct fb_info *info,
                      struct vm_area_struct *vma)
{
        struct pxafb_info *fbi = (struct pxafb_info *)info;
        unsigned long off = vma->vm_pgoff << PAGE_SHIFT;

        if (off < info->fix.smem_len) {
                vma->vm_pgoff += 1;
                return dma_mmap_writecombine(fbi->dev, vma, fbi->map_cpu,
                                             fbi->map_dma, fbi->map_size);
        }
        return -EINVAL;
}

static struct fb_ops pxafb_ops = {
        .owner          = THIS_MODULE,
        .fb_check_var   = pxafb_check_var,
        .fb_set_par     = pxafb_set_par,
        .fb_setcolreg   = pxafb_setcolreg,
        .fb_fillrect    = cfb_fillrect,
        .fb_copyarea    = cfb_copyarea,
        .fb_imageblit   = cfb_imageblit,
        .fb_blank       = pxafb_blank,
        .fb_mmap        = pxafb_mmap,
};

/*
 * Calculate the PCD value from the clock rate (in picoseconds).
 * We take account of the PPCR clock setting.
 * From PXA Developer's Manual:
 *
 *   PixelClock =      LCLK
 *                -------------
 *                2 ( PCD + 1 )
 *
 *   PCD =      LCLK
 *         ------------- - 1
 *         2(PixelClock)
 *
 * Where:
 *   LCLK = LCD/Memory Clock
 *   PCD = LCCR3[7:0]
 *
 * PixelClock here is in Hz while the pixclock argument given is the
 * period in picoseconds. Hence PixelClock = 1 / ( pixclock * 10^-12 )
 *
 * The function get_lclk_frequency_10khz returns LCLK in units of
 * 10khz. Calling the result of this function lclk gives us the
 * following
 *
 *    PCD = (lclk * 10^4 ) * ( pixclock * 10^-12 )
 *          -------------------------------------- - 1
 *                          2
 *
 * Factoring the 10^4 and 10^-12 out gives 10^-8 == 1 / 100000000 as used below.
 */
static inline unsigned int get_pcd(unsigned int pixclock)
{
        unsigned long long pcd;

        /* FIXME: Need to take into account Double Pixel Clock mode
         * (DPC) bit? or perhaps set it based on the various clock
         * speeds */

        pcd = (unsigned long long)get_lcdclk_frequency_10khz() * pixclock;
        do_div(pcd, 100000000 * 2);
        /* no need for this, since we should subtract 1 anyway. they cancel */
        /* pcd += 1; */ /* make up for integer math truncations */
        return (unsigned int)pcd;
}

/*
 * Some touchscreens need hsync information from the video driver to
 * function correctly. We export it here.
 */
static inline void set_hsync_time(struct pxafb_info *fbi, unsigned int pcd)
{
        unsigned long long htime;

        if ((pcd == 0) || (fbi->fb.var.hsync_len == 0)) {
                fbi->hsync_time=0;
                return;
        }

        htime = (unsigned long long)get_lcdclk_frequency_10khz() * 10000;
        do_div(htime, pcd * fbi->fb.var.hsync_len);
        fbi->hsync_time = htime;
}

unsigned long pxafb_get_hsync_time(struct device *dev)
{
        struct pxafb_info *fbi = dev_get_drvdata(dev);

        /* If display is blanked/suspended, hsync isn't active */
        if (!fbi || (fbi->state != C_ENABLE))
                return 0;

        return fbi->hsync_time;
}
EXPORT_SYMBOL(pxafb_get_hsync_time);

/*
 * pxafb_activate_var():
 *      Configures LCD Controller based on entries in var parameter.  Settings are
 *      only written to the controller if changes were made.
 */
static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *fbi)
{
        struct pxafb_lcd_reg new_regs;
        u_long flags;
        u_int lines_per_panel, pcd = get_pcd(var->pixclock);

        pr_debug("pxafb: Configuring PXA LCD\n");

        pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
                 var->xres, var->hsync_len,
                 var->left_margin, var->right_margin);
        pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
                 var->yres, var->vsync_len,
                 var->upper_margin, var->lower_margin);
        pr_debug("var: pixclock=%d pcd=%d\n", var->pixclock, pcd);

#if DEBUG_VAR
        if (var->xres < 16        || var->xres > 1024)
                printk(KERN_ERR "%s: invalid xres %d\n",
                        fbi->fb.fix.id, var->xres);
        switch(var->bits_per_pixel) {
        case 1:
        case 2:
        case 4:
        case 8:
        case 16:
                break;
        default:
                printk(KERN_ERR "%s: invalid bit depth %d\n",
                       fbi->fb.fix.id, var->bits_per_pixel);
                break;
        }
        if (var->hsync_len < 1    || var->hsync_len > 64)
                printk(KERN_ERR "%s: invalid hsync_len %d\n",
                        fbi->fb.fix.id, var->hsync_len);
        if (var->left_margin < 1  || var->left_margin > 255)
                printk(KERN_ERR "%s: invalid left_margin %d\n",
                        fbi->fb.fix.id, var->left_margin);
        if (var->right_margin < 1 || var->right_margin > 255)
                printk(KERN_ERR "%s: invalid right_margin %d\n",
                        fbi->fb.fix.id, var->right_margin);
        if (var->yres < 1         || var->yres > 1024)
                printk(KERN_ERR "%s: invalid yres %d\n",
                        fbi->fb.fix.id, var->yres);
        if (var->vsync_len < 1    || var->vsync_len > 64)
                printk(KERN_ERR "%s: invalid vsync_len %d\n",
                        fbi->fb.fix.id, var->vsync_len);
        if (var->upper_margin < 0 || var->upper_margin > 255)
                printk(KERN_ERR "%s: invalid upper_margin %d\n",
                        fbi->fb.fix.id, var->upper_margin);
        if (var->lower_margin < 0 || var->lower_margin > 255)
                printk(KERN_ERR "%s: invalid lower_margin %d\n",
                        fbi->fb.fix.id, var->lower_margin);
#endif

        new_regs.lccr0 = fbi->lccr0 |
                (LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM |
                 LCCR0_QDM | LCCR0_BM  | LCCR0_OUM);

        new_regs.lccr1 =
                LCCR1_DisWdth(var->xres) +
                LCCR1_HorSnchWdth(var->hsync_len) +
                LCCR1_BegLnDel(var->left_margin) +
                LCCR1_EndLnDel(var->right_margin);

        /*
         * If we have a dual scan LCD, we need to halve
         * the YRES parameter.
         */
        lines_per_panel = var->yres;
        if ((fbi->lccr0 & LCCR0_SDS) == LCCR0_Dual)
                lines_per_panel /= 2;

        new_regs.lccr2 =
                LCCR2_DisHght(lines_per_panel) +
                LCCR2_VrtSnchWdth(var->vsync_len) +
                LCCR2_BegFrmDel(var->upper_margin) +
                LCCR2_EndFrmDel(var->lower_margin);

        new_regs.lccr3 = fbi->lccr3 |
                pxafb_bpp_to_lccr3(var) |
                (var->sync & FB_SYNC_HOR_HIGH_ACT ? LCCR3_HorSnchH : LCCR3_HorSnchL) |
                (var->sync & FB_SYNC_VERT_HIGH_ACT ? LCCR3_VrtSnchH : LCCR3_VrtSnchL);

        if (pcd)
                new_regs.lccr3 |= LCCR3_PixClkDiv(pcd);

        pr_debug("nlccr0 = 0x%08x\n", new_regs.lccr0);
        pr_debug("nlccr1 = 0x%08x\n", new_regs.lccr1);
        pr_debug("nlccr2 = 0x%08x\n", new_regs.lccr2);
        pr_debug("nlccr3 = 0x%08x\n", new_regs.lccr3);

        /* Update shadow copy atomically */
        local_irq_save(flags);

        /* setup dma descriptors */
        fbi->dmadesc_fblow_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 3*16);
        fbi->dmadesc_fbhigh_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 2*16);
        fbi->dmadesc_palette_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 1*16);

        fbi->dmadesc_fblow_dma = fbi->palette_dma - 3*16;
        fbi->dmadesc_fbhigh_dma = fbi->palette_dma - 2*16;
        fbi->dmadesc_palette_dma = fbi->palette_dma - 1*16;

#define BYTES_PER_PANEL (lines_per_panel * fbi->fb.fix.line_length)

        /* populate descriptors */
        fbi->dmadesc_fblow_cpu->fdadr = fbi->dmadesc_fblow_dma;
        fbi->dmadesc_fblow_cpu->fsadr = fbi->screen_dma + BYTES_PER_PANEL;
        fbi->dmadesc_fblow_cpu->fidr  = 0;
        fbi->dmadesc_fblow_cpu->ldcmd = BYTES_PER_PANEL;

        fbi->fdadr1 = fbi->dmadesc_fblow_dma; /* only used in dual-panel mode */

        fbi->dmadesc_fbhigh_cpu->fsadr = fbi->screen_dma;
        fbi->dmadesc_fbhigh_cpu->fidr = 0;
        fbi->dmadesc_fbhigh_cpu->ldcmd = BYTES_PER_PANEL;

        fbi->dmadesc_palette_cpu->fsadr = fbi->palette_dma;
        fbi->dmadesc_palette_cpu->fidr  = 0;
        fbi->dmadesc_palette_cpu->ldcmd = (fbi->palette_size * 2) | LDCMD_PAL;

        if (var->bits_per_pixel == 16) {
                /* palette shouldn't be loaded in true-color mode */
                fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_fbhigh_dma;
                fbi->fdadr0 = fbi->dmadesc_fbhigh_dma; /* no pal just fbhigh */
                /* init it to something, even though we won't be using it */
                fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_palette_dma;
        } else {
                fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_fbhigh_dma;
                fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_palette_dma;
                fbi->fdadr0 = fbi->dmadesc_palette_dma; /* flips back and forth between pal and fbhigh */
        }

#if 0
        pr_debug("fbi->dmadesc_fblow_cpu = 0x%p\n", fbi->dmadesc_fblow_cpu);
        pr_debug("fbi->dmadesc_fbhigh_cpu = 0x%p\n", fbi->dmadesc_fbhigh_cpu);
        pr_debug("fbi->dmadesc_palette_cpu = 0x%p\n", fbi->dmadesc_palette_cpu);
        pr_debug("fbi->dmadesc_fblow_dma = 0x%x\n", fbi->dmadesc_fblow_dma);
        pr_debug("fbi->dmadesc_fbhigh_dma = 0x%x\n", fbi->dmadesc_fbhigh_dma);
        pr_debug("fbi->dmadesc_palette_dma = 0x%x\n", fbi->dmadesc_palette_dma);

        pr_debug("fbi->dmadesc_fblow_cpu->fdadr = 0x%x\n", fbi->dmadesc_fblow_cpu->fdadr);
        pr_debug("fbi->dmadesc_fbhigh_cpu->fdadr = 0x%x\n", fbi->dmadesc_fbhigh_cpu->fdadr);
        pr_debug("fbi->dmadesc_palette_cpu->fdadr = 0x%x\n", fbi->dmadesc_palette_cpu->fdadr);

        pr_debug("fbi->dmadesc_fblow_cpu->fsadr = 0x%x\n", fbi->dmadesc_fblow_cpu->fsadr);
        pr_debug("fbi->dmadesc_fbhigh_cpu->fsadr = 0x%x\n", fbi->dmadesc_fbhigh_cpu->fsadr);
        pr_debug("fbi->dmadesc_palette_cpu->fsadr = 0x%x\n", fbi->dmadesc_palette_cpu->fsadr);

        pr_debug("fbi->dmadesc_fblow_cpu->ldcmd = 0x%x\n", fbi->dmadesc_fblow_cpu->ldcmd);
        pr_debug("fbi->dmadesc_fbhigh_cpu->ldcmd = 0x%x\n", fbi->dmadesc_fbhigh_cpu->ldcmd);
        pr_debug("fbi->dmadesc_palette_cpu->ldcmd = 0x%x\n", fbi->dmadesc_palette_cpu->ldcmd);
#endif

        fbi->reg_lccr0 = new_regs.lccr0;
        fbi->reg_lccr1 = new_regs.lccr1;
        fbi->reg_lccr2 = new_regs.lccr2;
        fbi->reg_lccr3 = new_regs.lccr3;
        set_hsync_time(fbi, pcd);
        local_irq_restore(flags);

        /*
         * Only update the registers if the controller is enabled
         * and something has changed.
         */
        if ((LCCR0  != fbi->reg_lccr0) || (LCCR1  != fbi->reg_lccr1) ||
            (LCCR2  != fbi->reg_lccr2) || (LCCR3  != fbi->reg_lccr3) ||
            (FDADR0 != fbi->fdadr0)    || (FDADR1 != fbi->fdadr1))
                pxafb_schedule_work(fbi, C_REENABLE);

        return 0;
}

/*
 * NOTE!  The following functions are purely helpers for set_ctrlr_state.
 * Do not call them directly; set_ctrlr_state does the correct serialisation
 * to ensure that things happen in the right way 100% of time time.
 *      -- rmk
 */
static inline void __pxafb_backlight_power(struct pxafb_info *fbi, int on)
{
        pr_debug("pxafb: backlight o%s\n", on ? "n" : "ff");

        if (pxafb_backlight_power)
                pxafb_backlight_power(on);
}

static inline void __pxafb_lcd_power(struct pxafb_info *fbi, int on)
{
        pr_debug("pxafb: LCD power o%s\n", on ? "n" : "ff");

        if (pxafb_lcd_power)
                pxafb_lcd_power(on);
}

static void pxafb_setup_gpio(struct pxafb_info *fbi)
{
        int gpio, ldd_bits;
        unsigned int lccr0 = fbi->lccr0;

        /*
         * setup is based on type of panel supported
        */

        /* 4 bit interface */
        if ((lccr0 & LCCR0_CMS) == LCCR0_Mono &&
            (lccr0 & LCCR0_SDS) == LCCR0_Sngl &&
            (lccr0 & LCCR0_DPD) == LCCR0_4PixMono)
                ldd_bits = 4;

        /* 8 bit interface */
        else if (((lccr0 & LCCR0_CMS) == LCCR0_Mono &&
                  ((lccr0 & LCCR0_SDS) == LCCR0_Dual || (lccr0 & LCCR0_DPD) == LCCR0_8PixMono)) ||
                 ((lccr0 & LCCR0_CMS) == LCCR0_Color &&
                  (lccr0 & LCCR0_PAS) == LCCR0_Pas && (lccr0 & LCCR0_SDS) == LCCR0_Sngl))
                ldd_bits = 8;

        /* 16 bit interface */
        else if ((lccr0 & LCCR0_CMS) == LCCR0_Color &&
                 ((lccr0 & LCCR0_SDS) == LCCR0_Dual || (lccr0 & LCCR0_PAS) == LCCR0_Act))
                ldd_bits = 16;

        else {
                printk(KERN_ERR "pxafb_setup_gpio: unable to determine bits per pixel\n");
                return;
        }

        for (gpio = 58; ldd_bits; gpio++, ldd_bits--)
                pxa_gpio_mode(gpio | GPIO_ALT_FN_2_OUT);
        pxa_gpio_mode(GPIO74_LCD_FCLK_MD);
        pxa_gpio_mode(GPIO75_LCD_LCLK_MD);
        pxa_gpio_mode(GPIO76_LCD_PCLK_MD);
        pxa_gpio_mode(GPIO77_LCD_ACBIAS_MD);
}

static void pxafb_enable_controller(struct pxafb_info *fbi)
{
        pr_debug("pxafb: Enabling LCD controller\n");
        pr_debug("fdadr0 0x%08x\n", (unsigned int) fbi->fdadr0);
        pr_debug("fdadr1 0x%08x\n", (unsigned int) fbi->fdadr1);
        pr_debug("reg_lccr0 0x%08x\n", (unsigned int) fbi->reg_lccr0);
        pr_debug("reg_lccr1 0x%08x\n", (unsigned int) fbi->reg_lccr1);
        pr_debug("reg_lccr2 0x%08x\n", (unsigned int) fbi->reg_lccr2);
        pr_debug("reg_lccr3 0x%08x\n", (unsigned int) fbi->reg_lccr3);

        /* enable LCD controller clock */
        pxa_set_cken(CKEN16_LCD, 1);

        /* Sequence from 11.7.10 */
        LCCR3 = fbi->reg_lccr3;
        LCCR2 = fbi->reg_lccr2;
        LCCR1 = fbi->reg_lccr1;
        LCCR0 = fbi->reg_lccr0 & ~LCCR0_ENB;

        FDADR0 = fbi->fdadr0;
        FDADR1 = fbi->fdadr1;
        LCCR0 |= LCCR0_ENB;

        pr_debug("FDADR0 0x%08x\n", (unsigned int) FDADR0);
        pr_debug("FDADR1 0x%08x\n", (unsigned int) FDADR1);
        pr_debug("LCCR0 0x%08x\n", (unsigned int) LCCR0);
        pr_debug("LCCR1 0x%08x\n", (unsigned int) LCCR1);
        pr_debug("LCCR2 0x%08x\n", (unsigned int) LCCR2);
        pr_debug("LCCR3 0x%08x\n", (unsigned int) LCCR3);
}

static void pxafb_disable_controller(struct pxafb_info *fbi)
{
        DECLARE_WAITQUEUE(wait, current);

        pr_debug("pxafb: disabling LCD controller\n");

        set_current_state(TASK_UNINTERRUPTIBLE);
        add_wait_queue(&fbi->ctrlr_wait, &wait);

        LCSR = 0xffffffff;      /* Clear LCD Status Register */
        LCCR0 &= ~LCCR0_LDM;    /* Enable LCD Disable Done Interrupt */
        LCCR0 |= LCCR0_DIS;     /* Disable LCD Controller */

        schedule_timeout(200 * HZ / 1000);
        remove_wait_queue(&fbi->ctrlr_wait, &wait);

        /* disable LCD controller clock */
        pxa_set_cken(CKEN16_LCD, 0);
}

/*
 *  pxafb_handle_irq: Handle 'LCD DONE' interrupts.
 */
static irqreturn_t pxafb_handle_irq(int irq, void *dev_id, struct pt_regs *regs)
{
        struct pxafb_info *fbi = dev_id;
        unsigned int lcsr = LCSR;

        if (lcsr & LCSR_LDD) {
                LCCR0 |= LCCR0_LDM;
                wake_up(&fbi->ctrlr_wait);
        }

        LCSR = lcsr;
        return IRQ_HANDLED;
}

/*
 * This function must be called from task context only, since it will
 * sleep when disabling the LCD controller, or if we get two contending
 * processes trying to alter state.
 */
static void set_ctrlr_state(struct pxafb_info *fbi, u_int state)
{
        u_int old_state;

        down(&fbi->ctrlr_sem);

        old_state = fbi->state;

        /*
         * Hack around fbcon initialisation.
         */
        if (old_state == C_STARTUP && state == C_REENABLE)
                state = C_ENABLE;

        switch (state) {
        case C_DISABLE_CLKCHANGE:
                /*
                 * Disable controller for clock change.  If the
                 * controller is already disabled, then do nothing.
                 */
                if (old_state != C_DISABLE && old_state != C_DISABLE_PM) {
                        fbi->state = state;
                        //TODO __pxafb_lcd_power(fbi, 0);
                        pxafb_disable_controller(fbi);
                }
                break;

        case C_DISABLE_PM:
        case C_DISABLE:
                /*
                 * Disable controller
                 */
                if (old_state != C_DISABLE) {
                        fbi->state = state;
                        __pxafb_backlight_power(fbi, 0);
                        __pxafb_lcd_power(fbi, 0);
                        if (old_state != C_DISABLE_CLKCHANGE)
                                pxafb_disable_controller(fbi);
                }
                break;

        case C_ENABLE_CLKCHANGE:
                /*
                 * Enable the controller after clock change.  Only
                 * do this if we were disabled for the clock change.
                 */
                if (old_state == C_DISABLE_CLKCHANGE) {
                        fbi->state = C_ENABLE;
                        pxafb_enable_controller(fbi);
                        //TODO __pxafb_lcd_power(fbi, 1);
                }
                break;

        case C_REENABLE:
                /*
                 * Re-enable the controller only if it was already
                 * enabled.  This is so we reprogram the control
                 * registers.
                 */
                if (old_state == C_ENABLE) {
                        pxafb_disable_controller(fbi);
                        pxafb_setup_gpio(fbi);
                        pxafb_enable_controller(fbi);
                }
                break;

        case C_ENABLE_PM:
                /*
                 * Re-enable the controller after PM.  This is not
                 * perfect - think about the case where we were doing
                 * a clock change, and we suspended half-way through.
                 */
                if (old_state != C_DISABLE_PM)
                        break;
                /* fall through */

        case C_ENABLE:
                /*
                 * Power up the LCD screen, enable controller, and
                 * turn on the backlight.
                 */
                if (old_state != C_ENABLE) {
                        fbi->state = C_ENABLE;
                        pxafb_setup_gpio(fbi);
                        pxafb_enable_controller(fbi);
                        __pxafb_lcd_power(fbi, 1);
                        __pxafb_backlight_power(fbi, 1);
                }
                break;
        }
        up(&fbi->ctrlr_sem);
}

/*
 * Our LCD controller task (which is called when we blank or unblank)
 * via keventd.
 */
static void pxafb_task(void *dummy)
{
        struct pxafb_info *fbi = dummy;
        u_int state = xchg(&fbi->task_state, -1);

        set_ctrlr_state(fbi, state);
}

#ifdef CONFIG_CPU_FREQ
/*
 * CPU clock speed change handler.  We need to adjust the LCD timing
 * parameters when the CPU clock is adjusted by the power management
 * subsystem.
 *
 * TODO: Determine why f->new != 10*get_lclk_frequency_10khz()
 */
static int
pxafb_freq_transition(struct notifier_block *nb, unsigned long val, void *data)
{
        struct pxafb_info *fbi = TO_INF(nb, freq_transition);
        //TODO struct cpufreq_freqs *f = data;
        u_int pcd;

        switch (val) {
        case CPUFREQ_PRECHANGE:
                set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE);
                break;

        case CPUFREQ_POSTCHANGE:
                pcd = get_pcd(fbi->fb.var.pixclock);
                set_hsync_time(fbi, pcd);
                fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd);
                set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE);
                break;
        }
        return 0;
}

static int
pxafb_freq_policy(struct notifier_block *nb, unsigned long val, void *data)
{
        struct pxafb_info *fbi = TO_INF(nb, freq_policy);
        struct fb_var_screeninfo *var = &fbi->fb.var;
        struct cpufreq_policy *policy = data;

        switch (val) {
        case CPUFREQ_ADJUST:
        case CPUFREQ_INCOMPATIBLE:
                printk(KERN_DEBUG "min dma period: %d ps, "
                        "new clock %d kHz\n", pxafb_display_dma_period(var),
                        policy->max);
                // TODO: fill in min/max values
                break;
#if 0
        case CPUFREQ_NOTIFY:
                printk(KERN_ERR "%s: got CPUFREQ_NOTIFY\n", __FUNCTION__);
                do {} while(0);
                /* todo: panic if min/max values aren't fulfilled
                 * [can't really happen unless there's a bug in the
                 * CPU policy verification process *
                 */
                break;
#endif
        }
        return 0;
}
#endif

#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 pxafb_suspend(struct platform_device *dev, pm_message_t state)
{
        struct pxafb_info *fbi = platform_get_drvdata(dev);

        set_ctrlr_state(fbi, C_DISABLE_PM);
        return 0;
}

static int pxafb_resume(struct platform_device *dev)
{
        struct pxafb_info *fbi = platform_get_drvdata(dev);

        set_ctrlr_state(fbi, C_ENABLE_PM);
        return 0;
}
#else
#define pxafb_suspend   NULL
#define pxafb_resume    NULL
#endif

/*
 * pxafb_map_video_memory():
 *      Allocates the DRAM memory for the frame buffer.  This buffer is
 *      remapped into a non-cached, non-buffered, memory region to
 *      allow palette and pixel writes to occur without flushing the
 *      cache.  Once this area is remapped, all virtual memory
 *      access to the video memory should occur at the new region.
 */
static int __init pxafb_map_video_memory(struct pxafb_info *fbi)
{
        u_long palette_mem_size;

        /*
         * We reserve one page for the palette, plus the size
         * of the framebuffer.
         */
        fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + PAGE_SIZE);
        fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
                                              &fbi->map_dma, GFP_KERNEL);

        if (fbi->map_cpu) {
                /* prevent initial garbage on screen */
                memset(fbi->map_cpu, 0, fbi->map_size);
                fbi->fb.screen_base = fbi->map_cpu + PAGE_SIZE;
                fbi->screen_dma = fbi->map_dma + PAGE_SIZE;
                /*
                 * FIXME: this is actually the wrong thing to place in
                 * smem_start.  But fbdev suffers from the problem that
                 * it needs an API which doesn't exist (in this case,
                 * dma_writecombine_mmap)
                 */
                fbi->fb.fix.smem_start = fbi->screen_dma;

                fbi->palette_size = fbi->fb.var.bits_per_pixel == 8 ? 256 : 16;

                palette_mem_size = fbi->palette_size * sizeof(u16);
                pr_debug("pxafb: palette_mem_size = 0x%08lx\n", palette_mem_size);

                fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
                fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
        }

        return fbi->map_cpu ? 0 : -ENOMEM;
}

static struct pxafb_info * __init pxafb_init_fbinfo(struct device *dev)
{
        struct pxafb_info *fbi;
        void *addr;
        struct pxafb_mach_info *inf = dev->platform_data;

        /* Alloc the pxafb_info and pseudo_palette in one step */
        fbi = kmalloc(sizeof(struct pxafb_info) + sizeof(u32) * 16, GFP_KERNEL);
        if (!fbi)
                return NULL;

        memset(fbi, 0, sizeof(struct pxafb_info));
        fbi->dev = dev;

        strcpy(fbi->fb.fix.id, PXA_NAME);

        fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
        fbi->fb.fix.type_aux    = 0;
        fbi->fb.fix.xpanstep    = 0;
        fbi->fb.fix.ypanstep    = 0;
        fbi->fb.fix.ywrapstep   = 0;
        fbi->fb.fix.accel       = FB_ACCEL_NONE;

        fbi->fb.var.nonstd      = 0;
        fbi->fb.var.activate    = FB_ACTIVATE_NOW;
        fbi->fb.var.height      = -1;
        fbi->fb.var.width       = -1;
        fbi->fb.var.accel_flags = 0;
        fbi->fb.var.vmode       = FB_VMODE_NONINTERLACED;

        fbi->fb.fbops           = &pxafb_ops;
        fbi->fb.flags           = FBINFO_DEFAULT;
        fbi->fb.node            = -1;

        addr = fbi;
        addr = addr + sizeof(struct pxafb_info);
        fbi->fb.pseudo_palette  = addr;

        fbi->max_xres                   = inf->xres;
        fbi->fb.var.xres                = inf->xres;
        fbi->fb.var.xres_virtual        = inf->xres;
        fbi->max_yres                   = inf->yres;
        fbi->fb.var.yres                = inf->yres;
        fbi->fb.var.yres_virtual        = inf->yres;
        fbi->max_bpp                    = inf->bpp;
        fbi->fb.var.bits_per_pixel      = inf->bpp;
        fbi->fb.var.pixclock            = inf->pixclock;
        fbi->fb.var.hsync_len           = inf->hsync_len;
        fbi->fb.var.left_margin         = inf->left_margin;
        fbi->fb.var.right_margin        = inf->right_margin;
        fbi->fb.var.vsync_len           = inf->vsync_len;
        fbi->fb.var.upper_margin        = inf->upper_margin;
        fbi->fb.var.lower_margin        = inf->lower_margin;
        fbi->fb.var.sync                = inf->sync;
        fbi->fb.var.grayscale           = inf->cmap_greyscale;
        fbi->cmap_inverse               = inf->cmap_inverse;
        fbi->cmap_static                = inf->cmap_static;
        fbi->lccr0                      = inf->lccr0;
        fbi->lccr3                      = inf->lccr3;
        fbi->state                      = C_STARTUP;
        fbi->task_state                 = (u_char)-1;
        fbi->fb.fix.smem_len            = fbi->max_xres * fbi->max_yres *
                                          fbi->max_bpp / 8;

        init_waitqueue_head(&fbi->ctrlr_wait);
        INIT_WORK(&fbi->task, pxafb_task, fbi);
        init_MUTEX(&fbi->ctrlr_sem);

        return fbi;
}

#ifdef CONFIG_FB_PXA_PARAMETERS
static int __init pxafb_parse_options(struct device *dev, char *options)
{
        struct pxafb_mach_info *inf = dev->platform_data;
        char *this_opt;

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

        dev_dbg(dev, "options are \"%s\"\n", options ? options : "null");

        /* could be made table driven or similar?... */
        while ((this_opt = strsep(&options, ",")) != NULL) {
                if (!strncmp(this_opt, "mode:", 5)) {
                        const char *name = this_opt+5;
                        unsigned int namelen = strlen(name);
                        int res_specified = 0, bpp_specified = 0;
                        unsigned int xres = 0, yres = 0, bpp = 0;
                        int yres_specified = 0;
                        int i;
                        for (i = namelen-1; i >= 0; i--) {
                                switch (name[i]) {
                                case '-':
                                        namelen = i;
                                        if (!bpp_specified && !yres_specified) {
                                                bpp = simple_strtoul(&name[i+1], NULL, 0);
                                                bpp_specified = 1;
                                        } else
                                                goto done;
                                        break;
                                case 'x':
                                        if (!yres_specified) {
                                                yres = simple_strtoul(&name[i+1], NULL, 0);
                                                yres_specified = 1;
                                        } else
                                                goto done;
                                        break;
                                case '0'...'9':
                                        break;
                                default:
                                        goto done;
                                }
                        }
                        if (i < 0 && yres_specified) {
                                xres = simple_strtoul(name, NULL, 0);
                                res_specified = 1;
                        }
                done:
                        if (res_specified) {
                                dev_info(dev, "overriding resolution: %dx%d\n", xres, yres);
                                inf->xres = xres; inf->yres = yres;
                        }
                        if (bpp_specified)
                                switch (bpp) {
                                case 1:
                                case 2:
                                case 4:
                                case 8:
                                case 16:
                                        inf->bpp = bpp;
                                        dev_info(dev, "overriding bit depth: %d\n", bpp);
                                        break;
                                default:
                                        dev_err(dev, "Depth %d is not valid\n", bpp);
                                }
                } else if (!strncmp(this_opt, "pixclock:", 9)) {
                        inf->pixclock = simple_strtoul(this_opt+9, NULL, 0);
                        dev_info(dev, "override pixclock: %ld\n", inf->pixclock);
                } else if (!strncmp(this_opt, "left:", 5)) {
                        inf->left_margin = simple_strtoul(this_opt+5, NULL, 0);
                        dev_info(dev, "override left: %u\n", inf->left_margin);
                } else if (!strncmp(this_opt, "right:", 6)) {
                        inf->right_margin = simple_strtoul(this_opt+6, NULL, 0);
                        dev_info(dev, "override right: %u\n", inf->right_margin);
                } else if (!strncmp(this_opt, "upper:", 6)) {
                        inf->upper_margin = simple_strtoul(this_opt+6, NULL, 0);
                        dev_info(dev, "override upper: %u\n", inf->upper_margin);
                } else if (!strncmp(this_opt, "lower:", 6)) {
                        inf->lower_margin = simple_strtoul(this_opt+6, NULL, 0);
                        dev_info(dev, "override lower: %u\n", inf->lower_margin);
                } else if (!strncmp(this_opt, "hsynclen:", 9)) {
                        inf->hsync_len = simple_strtoul(this_opt+9, NULL, 0);
                        dev_info(dev, "override hsynclen: %u\n", inf->hsync_len);
                } else if (!strncmp(this_opt, "vsynclen:", 9)) {
                        inf->vsync_len = simple_strtoul(this_opt+9, NULL, 0);
                        dev_info(dev, "override vsynclen: %u\n", inf->vsync_len);
                } else if (!strncmp(this_opt, "hsync:", 6)) {
                        if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
                                dev_info(dev, "override hsync: Active Low\n");
                                inf->sync &= ~FB_SYNC_HOR_HIGH_ACT;
                        } else {
                                dev_info(dev, "override hsync: Active High\n");
                                inf->sync |= FB_SYNC_HOR_HIGH_ACT;
                        }
                } else if (!strncmp(this_opt, "vsync:", 6)) {
                        if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
                                dev_info(dev, "override vsync: Active Low\n");
                                inf->sync &= ~FB_SYNC_VERT_HIGH_ACT;
                        } else {
                                dev_info(dev, "override vsync: Active High\n");
                                inf->sync |= FB_SYNC_VERT_HIGH_ACT;
                        }
                } else if (!strncmp(this_opt, "dpc:", 4)) {
                        if (simple_strtoul(this_opt+4, NULL, 0) == 0) {
                                dev_info(dev, "override double pixel clock: false\n");
                                inf->lccr3 &= ~LCCR3_DPC;
                        } else {
                                dev_info(dev, "override double pixel clock: true\n");
                                inf->lccr3 |= LCCR3_DPC;
                        }
                } else if (!strncmp(this_opt, "outputen:", 9)) {
                        if (simple_strtoul(this_opt+9, NULL, 0) == 0) {
                                dev_info(dev, "override output enable: active low\n");
                                inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnL;
                        } else {
                                dev_info(dev, "override output enable: active high\n");
                                inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnH;
                        }
                } else if (!strncmp(this_opt, "pixclockpol:", 12)) {
                        if (simple_strtoul(this_opt+12, NULL, 0) == 0) {
                                dev_info(dev, "override pixel clock polarity: falling edge\n");
                                inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixFlEdg;
                        } else {
                                dev_info(dev, "override pixel clock polarity: rising edge\n");
                                inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixRsEdg;
                        }
                } else if (!strncmp(this_opt, "color", 5)) {
                        inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Color;
                } else if (!strncmp(this_opt, "mono", 4)) {
                        inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Mono;
                } else if (!strncmp(this_opt, "active", 6)) {
                        inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Act;
                } else if (!strncmp(this_opt, "passive", 7)) {
                        inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Pas;
                } else if (!strncmp(this_opt, "single", 6)) {
                        inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Sngl;
                } else if (!strncmp(this_opt, "dual", 4)) {
                        inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Dual;
                } else if (!strncmp(this_opt, "4pix", 4)) {
                        inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_4PixMono;
                } else if (!strncmp(this_opt, "8pix", 4)) {
                        inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_8PixMono;
                } else {
                        dev_err(dev, "unknown option: %s\n", this_opt);
                        return -EINVAL;
                }
        }
        return 0;

}
#endif

int __init pxafb_probe(struct platform_device *dev)
{
        struct pxafb_info *fbi;
        struct pxafb_mach_info *inf;
        int ret;

        dev_dbg(&dev->dev, "pxafb_probe\n");

        inf = dev->dev.platform_data;
        ret = -ENOMEM;
        fbi = NULL;
        if (!inf)
                goto failed;

#ifdef CONFIG_FB_PXA_PARAMETERS
        ret = pxafb_parse_options(&dev->dev, g_options);
        if (ret < 0)
                goto failed;
#endif

#ifdef DEBUG_VAR
        /* Check for various illegal bit-combinations. Currently only
         * a warning is given. */

        if (inf->lccr0 & LCCR0_INVALID_CONFIG_MASK)
                dev_warn(&dev->dev, "machine LCCR0 setting contains illegal bits: %08x\n",
                        inf->lccr0 & LCCR0_INVALID_CONFIG_MASK);
        if (inf->lccr3 & LCCR3_INVALID_CONFIG_MASK)
                dev_warn(&dev->dev, "machine LCCR3 setting contains illegal bits: %08x\n",
                        inf->lccr3 & LCCR3_INVALID_CONFIG_MASK);
        if (inf->lccr0 & LCCR0_DPD &&
            ((inf->lccr0 & LCCR0_PAS) != LCCR0_Pas ||
             (inf->lccr0 & LCCR0_SDS) != LCCR0_Sngl ||
             (inf->lccr0 & LCCR0_CMS) != LCCR0_Mono))
                dev_warn(&dev->dev, "Double Pixel Data (DPD) mode is only valid in passive mono"
                         " single panel mode\n");
        if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Act &&
            (inf->lccr0 & LCCR0_SDS) == LCCR0_Dual)
                dev_warn(&dev->dev, "Dual panel only valid in passive mode\n");
        if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Pas &&
             (inf->upper_margin || inf->lower_margin))
                dev_warn(&dev->dev, "Upper and lower margins must be 0 in passive mode\n");
#endif

        dev_dbg(&dev->dev, "got a %dx%dx%d LCD\n",inf->xres, inf->yres, inf->bpp);
        if (inf->xres == 0 || inf->yres == 0 || inf->bpp == 0) {
                dev_err(&dev->dev, "Invalid resolution or bit depth\n");
                ret = -EINVAL;
                goto failed;
        }
        pxafb_backlight_power = inf->pxafb_backlight_power;
        pxafb_lcd_power = inf->pxafb_lcd_power;
        fbi = pxafb_init_fbinfo(&dev->dev);
        if (!fbi) {
                dev_err(&dev->dev, "Failed to initialize framebuffer device\n");
                ret = -ENOMEM; // only reason for pxafb_init_fbinfo to fail is kmalloc
                goto failed;
        }

        /* Initialize video memory */
        ret = pxafb_map_video_memory(fbi);
        if (ret) {
                dev_err(&dev->dev, "Failed to allocate video RAM: %d\n", ret);
                ret = -ENOMEM;
                goto failed;
        }

        ret = request_irq(IRQ_LCD, pxafb_handle_irq, SA_INTERRUPT, "LCD", fbi);
        if (ret) {
                dev_err(&dev->dev, "request_irq failed: %d\n", ret);
                ret = -EBUSY;
                goto failed;
        }

        /*
         * This makes sure that our colour bitfield
         * descriptors are correctly initialised.
         */
        pxafb_check_var(&fbi->fb.var, &fbi->fb);
        pxafb_set_par(&fbi->fb);

        platform_set_drvdata(dev, fbi);

        ret = register_framebuffer(&fbi->fb);
        if (ret < 0) {
                dev_err(&dev->dev, "Failed to register framebuffer device: %d\n", ret);
                goto failed;
        }

#ifdef CONFIG_PM
        // TODO
#endif

#ifdef CONFIG_CPU_FREQ
        fbi->freq_transition.notifier_call = pxafb_freq_transition;
        fbi->freq_policy.notifier_call = pxafb_freq_policy;
        cpufreq_register_notifier(&fbi->freq_transition, CPUFREQ_TRANSITION_NOTIFIER);
        cpufreq_register_notifier(&fbi->freq_policy, CPUFREQ_POLICY_NOTIFIER);
#endif

        /*
         * Ok, now enable the LCD controller
         */
        set_ctrlr_state(fbi, C_ENABLE);

        return 0;

failed:
        platform_set_drvdata(dev, NULL);
        kfree(fbi);
        return ret;
}

static struct platform_driver pxafb_driver = {
        .probe          = pxafb_probe,
#ifdef CONFIG_PM
        .suspend        = pxafb_suspend,
        .resume         = pxafb_resume,
#endif
        .driver         = {
                .name   = "pxa2xx-fb",
        },
};

#ifndef MODULE
int __devinit pxafb_setup(char *options)
{
# ifdef CONFIG_FB_PXA_PARAMETERS
        if (options)
                strlcpy(g_options, options, sizeof(g_options));
# endif
        return 0;
}
#else
# ifdef CONFIG_FB_PXA_PARAMETERS
module_param_string(options, g_options, sizeof(g_options), 0);
MODULE_PARM_DESC(options, "LCD parameters (see Documentation/fb/pxafb.txt)");
# endif
#endif

int __devinit pxafb_init(void)
{
#ifndef MODULE
        char *option = NULL;

        if (fb_get_options("pxafb", &option))
                return -ENODEV;
        pxafb_setup(option);
#endif
        return platform_driver_register(&pxafb_driver);
}

module_init(pxafb_init);

MODULE_DESCRIPTION("loadable framebuffer driver for PXA");
MODULE_LICENSE("GPL");