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[linux-2.6/mini2440.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/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/mm.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 <linux/clk.h>
#include <linux/err.h>
#include <linux/completion.h>
#include <linux/mutex.h>
#include <linux/kthread.h>
#include <linux/freezer.h>

#include <mach/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/div64.h>
#include <mach/pxa-regs.h>
#include <mach/pxa2xx-gpio.h>
#include <mach/bitfield.h>
#include <mach/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, struct fb_var_screeninfo *);

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);

static inline unsigned long
lcd_readl(struct pxafb_info *fbi, unsigned int off)
{
        return __raw_readl(fbi->mmio_base + off);
}

static inline void
lcd_writel(struct pxafb_info *fbi, unsigned int off, unsigned long val)
{
        __raw_writel(val, fbi->mmio_base + off);
}

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;

        if (regno >= fbi->palette_size)
                return 1;

        if (fbi->fb.var.grayscale) {
                fbi->palette_cpu[regno] = ((blue >> 8) & 0x00ff);
                return 0;
        }

        switch (fbi->lccr4 & LCCR4_PAL_FOR_MASK) {
        case LCCR4_PAL_FOR_0:
                val  = ((red   >>  0) & 0xf800);
                val |= ((green >>  5) & 0x07e0);
                val |= ((blue  >> 11) & 0x001f);
                fbi->palette_cpu[regno] = val;
                break;
        case LCCR4_PAL_FOR_1:
                val  = ((red   << 8) & 0x00f80000);
                val |= ((green >> 0) & 0x0000fc00);
                val |= ((blue  >> 8) & 0x000000f8);
                ((u32 *)(fbi->palette_cpu))[regno] = val;
                break;
        case LCCR4_PAL_FOR_2:
                val  = ((red   << 8) & 0x00fc0000);
                val |= ((green >> 0) & 0x0000fc00);
                val |= ((blue  >> 8) & 0x000000fc);
                ((u32 *)(fbi->palette_cpu))[regno] = val;
                break;
        }

        return 0;
}

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;
        case 24:
                switch (var->red.length + var->green.length +
                                var->blue.length + var->transp.length) {
                case 18: ret = LCCR3_18BPP_P | LCCR3_PDFOR_3; break;
                case 19: ret = LCCR3_19BPP_P; break;
                }
                break;
        case 32:
                switch (var->red.length + var->green.length +
                                var->blue.length + var->transp.length) {
                case 18: ret = LCCR3_18BPP | LCCR3_PDFOR_3; break;
                case 19: ret = LCCR3_19BPP; break;
                case 24: ret = LCCR3_24BPP | LCCR3_PDFOR_3; break;
                case 25: ret = LCCR3_25BPP; break;
                }
                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;
}
#endif

/*
 * Select the smallest mode that allows the desired resolution to be
 * displayed. If desired parameters can be rounded up.
 */
static struct pxafb_mode_info *pxafb_getmode(struct pxafb_mach_info *mach,
                                             struct fb_var_screeninfo *var)
{
        struct pxafb_mode_info *mode = NULL;
        struct pxafb_mode_info *modelist = mach->modes;
        unsigned int best_x = 0xffffffff, best_y = 0xffffffff;
        unsigned int i;

        for (i = 0; i < mach->num_modes; i++) {
                if (modelist[i].xres >= var->xres &&
                    modelist[i].yres >= var->yres &&
                    modelist[i].xres < best_x &&
                    modelist[i].yres < best_y &&
                    modelist[i].bpp >= var->bits_per_pixel) {
                        best_x = modelist[i].xres;
                        best_y = modelist[i].yres;
                        mode = &modelist[i];
                }
        }

        return mode;
}

static void pxafb_setmode(struct fb_var_screeninfo *var,
                          struct pxafb_mode_info *mode)
{
        var->xres               = mode->xres;
        var->yres               = mode->yres;
        var->bits_per_pixel     = mode->bpp;
        var->pixclock           = mode->pixclock;
        var->hsync_len          = mode->hsync_len;
        var->left_margin        = mode->left_margin;
        var->right_margin       = mode->right_margin;
        var->vsync_len          = mode->vsync_len;
        var->upper_margin       = mode->upper_margin;
        var->lower_margin       = mode->lower_margin;
        var->sync               = mode->sync;
        var->grayscale          = mode->cmap_greyscale;
        var->xres_virtual       = var->xres;
        var->yres_virtual       = var->yres;
}

/*
 *  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;
        struct pxafb_mach_info *inf = fbi->dev->platform_data;

        if (var->xres < MIN_XRES)
                var->xres = MIN_XRES;
        if (var->yres < MIN_YRES)
                var->yres = MIN_YRES;

        if (inf->fixed_modes) {
                struct pxafb_mode_info *mode;

                mode = pxafb_getmode(inf, var);
                if (!mode)
                        return -EINVAL;
                pxafb_setmode(var, mode);
        } else {
                if (var->xres > inf->modes->xres)
                        return -EINVAL;
                if (var->yres > inf->modes->yres)
                        return -EINVAL;
                if (var->bits_per_pixel > inf->modes->bpp)
                        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 if (var->bits_per_pixel > 16) {
                struct pxafb_mode_info *mode;

                mode = pxafb_getmode(inf, var);
                if (!mode)
                        return -EINVAL;

                switch (mode->depth) {
                case 18: /* RGB666 */
                        var->transp.offset = var->transp.length     = 0;
                        var->red.offset    = 12; var->red.length    = 6;
                        var->green.offset  = 6;  var->green.length  = 6;
                        var->blue.offset   = 0;  var->blue.length   = 6;
                        break;
                case 19: /* RGBT666 */
                        var->transp.offset = 18; var->transp.length = 1;
                        var->red.offset    = 12; var->red.length    = 6;
                        var->green.offset  = 6;  var->green.length  = 6;
                        var->blue.offset   = 0;  var->blue.length   = 6;
                        break;
                case 24: /* RGB888 */
                        var->transp.offset = var->transp.length     = 0;
                        var->red.offset    = 16; var->red.length    = 8;
                        var->green.offset  = 8;  var->green.length  = 8;
                        var->blue.offset   = 0;  var->blue.length   = 8;
                        break;
                case 25: /* RGBT888 */
                        var->transp.offset = 24; var->transp.length = 1;
                        var->red.offset    = 16; var->red.length    = 8;
                        var->green.offset  = 8;  var->green.length  = 8;
                        var->blue.offset   = 0;  var->blue.length   = 8;
                        break;
                default:
                        return -EINVAL;
                }
        } else {
                var->red.offset = var->green.offset = 0;
                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\n",
                 pxafb_display_dma_period(var));
#endif

        return 0;
}

static inline void pxafb_set_truecolor(u_int 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;

        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;

        fbi->palette_cpu = (u16 *)&fbi->dma_buff->palette[0];

        /*
         * 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;
}

/*
 * 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;

        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 += fbi->video_offset / PAGE_SIZE;
                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(struct pxafb_info *fbi,
                                   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)(clk_get_rate(fbi->clk) / 10000);
        pcd *= 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.  Note that 'hsync_time' and
 * the value returned from pxafb_get_hsync_time() is the *reciprocal*
 * of the hsync period in seconds.
 */
static inline void set_hsync_time(struct pxafb_info *fbi, unsigned int pcd)
{
        unsigned long htime;

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

        htime = clk_get_rate(fbi->clk) / (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);

static int setup_frame_dma(struct pxafb_info *fbi, int dma, int pal,
                unsigned int offset, size_t size)
{
        struct pxafb_dma_descriptor *dma_desc, *pal_desc;
        unsigned int dma_desc_off, pal_desc_off;

        if (dma < 0 || dma >= DMA_MAX)
                return -EINVAL;

        dma_desc = &fbi->dma_buff->dma_desc[dma];
        dma_desc_off = offsetof(struct pxafb_dma_buff, dma_desc[dma]);

        dma_desc->fsadr = fbi->screen_dma + offset;
        dma_desc->fidr  = 0;
        dma_desc->ldcmd = size;

        if (pal < 0 || pal >= PAL_MAX) {
                dma_desc->fdadr = fbi->dma_buff_phys + dma_desc_off;
                fbi->fdadr[dma] = fbi->dma_buff_phys + dma_desc_off;
        } else {
                pal_desc = &fbi->dma_buff->pal_desc[pal];
                pal_desc_off = offsetof(struct pxafb_dma_buff, pal_desc[pal]);

                pal_desc->fsadr = fbi->dma_buff_phys + pal * PALETTE_SIZE;
                pal_desc->fidr  = 0;

                if ((fbi->lccr4 & LCCR4_PAL_FOR_MASK) == LCCR4_PAL_FOR_0)
                        pal_desc->ldcmd = fbi->palette_size * sizeof(u16);
                else
                        pal_desc->ldcmd = fbi->palette_size * sizeof(u32);

                pal_desc->ldcmd |= LDCMD_PAL;

                /* flip back and forth between palette and frame buffer */
                pal_desc->fdadr = fbi->dma_buff_phys + dma_desc_off;
                dma_desc->fdadr = fbi->dma_buff_phys + pal_desc_off;
                fbi->fdadr[dma] = fbi->dma_buff_phys + dma_desc_off;
        }

        return 0;
}

#ifdef CONFIG_FB_PXA_SMARTPANEL
static int setup_smart_dma(struct pxafb_info *fbi)
{
        struct pxafb_dma_descriptor *dma_desc;
        unsigned long dma_desc_off, cmd_buff_off;

        dma_desc = &fbi->dma_buff->dma_desc[DMA_CMD];
        dma_desc_off = offsetof(struct pxafb_dma_buff, dma_desc[DMA_CMD]);
        cmd_buff_off = offsetof(struct pxafb_dma_buff, cmd_buff);

        dma_desc->fdadr = fbi->dma_buff_phys + dma_desc_off;
        dma_desc->fsadr = fbi->dma_buff_phys + cmd_buff_off;
        dma_desc->fidr  = 0;
        dma_desc->ldcmd = fbi->n_smart_cmds * sizeof(uint16_t);

        fbi->fdadr[DMA_CMD] = dma_desc->fdadr;
        return 0;
}

int pxafb_smart_flush(struct fb_info *info)
{
        struct pxafb_info *fbi = container_of(info, struct pxafb_info, fb);
        uint32_t prsr;
        int ret = 0;

        /* disable controller until all registers are set up */
        lcd_writel(fbi, LCCR0, fbi->reg_lccr0 & ~LCCR0_ENB);

        /* 1. make it an even number of commands to align on 32-bit boundary
         * 2. add the interrupt command to the end of the chain so we can
         *    keep track of the end of the transfer
         */

        while (fbi->n_smart_cmds & 1)
                fbi->smart_cmds[fbi->n_smart_cmds++] = SMART_CMD_NOOP;

        fbi->smart_cmds[fbi->n_smart_cmds++] = SMART_CMD_INTERRUPT;
        fbi->smart_cmds[fbi->n_smart_cmds++] = SMART_CMD_WAIT_FOR_VSYNC;
        setup_smart_dma(fbi);

        /* continue to execute next command */
        prsr = lcd_readl(fbi, PRSR) | PRSR_ST_OK | PRSR_CON_NT;
        lcd_writel(fbi, PRSR, prsr);

        /* stop the processor in case it executed "wait for sync" cmd */
        lcd_writel(fbi, CMDCR, 0x0001);

        /* don't send interrupts for fifo underruns on channel 6 */
        lcd_writel(fbi, LCCR5, LCCR5_IUM(6));

        lcd_writel(fbi, LCCR1, fbi->reg_lccr1);
        lcd_writel(fbi, LCCR2, fbi->reg_lccr2);
        lcd_writel(fbi, LCCR3, fbi->reg_lccr3);
        lcd_writel(fbi, FDADR0, fbi->fdadr[0]);
        lcd_writel(fbi, FDADR6, fbi->fdadr[6]);

        /* begin sending */
        lcd_writel(fbi, LCCR0, fbi->reg_lccr0 | LCCR0_ENB);

        if (wait_for_completion_timeout(&fbi->command_done, HZ/2) == 0) {
                pr_warning("%s: timeout waiting for command done\n",
                                __func__);
                ret = -ETIMEDOUT;
        }

        /* quick disable */
        prsr = lcd_readl(fbi, PRSR) & ~(PRSR_ST_OK | PRSR_CON_NT);
        lcd_writel(fbi, PRSR, prsr);
        lcd_writel(fbi, LCCR0, fbi->reg_lccr0 & ~LCCR0_ENB);
        lcd_writel(fbi, FDADR6, 0);
        fbi->n_smart_cmds = 0;
        return ret;
}

int pxafb_smart_queue(struct fb_info *info, uint16_t *cmds, int n_cmds)
{
        int i;
        struct pxafb_info *fbi = container_of(info, struct pxafb_info, fb);

        /* leave 2 commands for INTERRUPT and WAIT_FOR_SYNC */
        for (i = 0; i < n_cmds; i++) {
                if (fbi->n_smart_cmds == CMD_BUFF_SIZE - 8)
                        pxafb_smart_flush(info);

                fbi->smart_cmds[fbi->n_smart_cmds++] = *cmds++;
        }

        return 0;
}

static unsigned int __smart_timing(unsigned time_ns, unsigned long lcd_clk)
{
        unsigned int t = (time_ns * (lcd_clk / 1000000) / 1000);
        return (t == 0) ? 1 : t;
}

static void setup_smart_timing(struct pxafb_info *fbi,
                                struct fb_var_screeninfo *var)
{
        struct pxafb_mach_info *inf = fbi->dev->platform_data;
        struct pxafb_mode_info *mode = &inf->modes[0];
        unsigned long lclk = clk_get_rate(fbi->clk);
        unsigned t1, t2, t3, t4;

        t1 = max(mode->a0csrd_set_hld, mode->a0cswr_set_hld);
        t2 = max(mode->rd_pulse_width, mode->wr_pulse_width);
        t3 = mode->op_hold_time;
        t4 = mode->cmd_inh_time;

        fbi->reg_lccr1 =
                LCCR1_DisWdth(var->xres) |
                LCCR1_BegLnDel(__smart_timing(t1, lclk)) |
                LCCR1_EndLnDel(__smart_timing(t2, lclk)) |
                LCCR1_HorSnchWdth(__smart_timing(t3, lclk));

        fbi->reg_lccr2 = LCCR2_DisHght(var->yres);
        fbi->reg_lccr3 = LCCR3_PixClkDiv(__smart_timing(t4, lclk));

        /* FIXME: make this configurable */
        fbi->reg_cmdcr = 1;
}

static int pxafb_smart_thread(void *arg)
{
        struct pxafb_info *fbi = arg;
        struct pxafb_mach_info *inf = fbi->dev->platform_data;

        if (!fbi || !inf->smart_update) {
                pr_err("%s: not properly initialized, thread terminated\n",
                                __func__);
                return -EINVAL;
        }

        pr_debug("%s(): task starting\n", __func__);

        set_freezable();
        while (!kthread_should_stop()) {

                if (try_to_freeze())
                        continue;

                if (fbi->state == C_ENABLE) {
                        inf->smart_update(&fbi->fb);
                        complete(&fbi->refresh_done);
                }

                set_current_state(TASK_INTERRUPTIBLE);
                schedule_timeout(30 * HZ / 1000);
        }

        pr_debug("%s(): task ending\n", __func__);
        return 0;
}

static int pxafb_smart_init(struct pxafb_info *fbi)
{
        fbi->smart_thread = kthread_run(pxafb_smart_thread, fbi,
                                        "lcd_refresh");
        if (IS_ERR(fbi->smart_thread)) {
                printk(KERN_ERR "%s: unable to create kernel thread\n",
                                __func__);
                return PTR_ERR(fbi->smart_thread);
        }
        return 0;
}
#else
int pxafb_smart_queue(struct fb_info *info, uint16_t *cmds, int n_cmds)
{
        return 0;
}

int pxafb_smart_flush(struct fb_info *info)
{
        return 0;
}
#endif /* CONFIG_FB_SMART_PANEL */

static void setup_parallel_timing(struct pxafb_info *fbi,
                                  struct fb_var_screeninfo *var)
{
        unsigned int lines_per_panel, pcd = get_pcd(fbi, var->pixclock);

        fbi->reg_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;

        fbi->reg_lccr2 =
                LCCR2_DisHght(lines_per_panel) +
                LCCR2_VrtSnchWdth(var->vsync_len) +
                LCCR2_BegFrmDel(var->upper_margin) +
                LCCR2_EndFrmDel(var->lower_margin);

        fbi->reg_lccr3 = fbi->lccr3 |
                (var->sync & FB_SYNC_HOR_HIGH_ACT ?
                 LCCR3_HorSnchH : LCCR3_HorSnchL) |
                (var->sync & FB_SYNC_VERT_HIGH_ACT ?
                 LCCR3_VrtSnchH : LCCR3_VrtSnchL);

        if (pcd) {
                fbi->reg_lccr3 |= LCCR3_PixClkDiv(pcd);
                set_hsync_time(fbi, pcd);
        }
}

/*
 * 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)
{
        u_long flags;
        size_t nbytes;

#if DEBUG_VAR
        if (!(fbi->lccr0 & LCCR0_LCDT)) {
                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:
                case 24:
                case 32:
                        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
        /* Update shadow copy atomically */
        local_irq_save(flags);

#ifdef CONFIG_FB_PXA_SMARTPANEL
        if (fbi->lccr0 & LCCR0_LCDT)
                setup_smart_timing(fbi, var);
        else
#endif
                setup_parallel_timing(fbi, var);

        fbi->reg_lccr0 = fbi->lccr0 |
                (LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM |
                 LCCR0_QDM | LCCR0_BM  | LCCR0_OUM);

        fbi->reg_lccr3 |= pxafb_bpp_to_lccr3(var);

        nbytes = var->yres * fbi->fb.fix.line_length;

        if ((fbi->lccr0 & LCCR0_SDS) == LCCR0_Dual) {
                nbytes = nbytes / 2;
                setup_frame_dma(fbi, DMA_LOWER, PAL_NONE, nbytes, nbytes);
        }

        if ((var->bits_per_pixel >= 16) || (fbi->lccr0 & LCCR0_LCDT))
                setup_frame_dma(fbi, DMA_BASE, PAL_NONE, 0, nbytes);
        else
                setup_frame_dma(fbi, DMA_BASE, PAL_BASE, 0, nbytes);

        fbi->reg_lccr4 = lcd_readl(fbi, LCCR4) & ~LCCR4_PAL_FOR_MASK;
        fbi->reg_lccr4 |= (fbi->lccr4 & LCCR4_PAL_FOR_MASK);
        local_irq_restore(flags);

        /*
         * Only update the registers if the controller is enabled
         * and something has changed.
         */
        if ((lcd_readl(fbi, LCCR0) != fbi->reg_lccr0) ||
            (lcd_readl(fbi, LCCR1) != fbi->reg_lccr1) ||
            (lcd_readl(fbi, LCCR2) != fbi->reg_lccr2) ||
            (lcd_readl(fbi, LCCR3) != fbi->reg_lccr3) ||
            (lcd_readl(fbi, FDADR0) != fbi->fdadr[0]) ||
            (lcd_readl(fbi, FDADR1) != fbi->fdadr[1]))
                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, &fbi->fb.var);
}

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);
        /* 18 bit interface */
        if (fbi->fb.var.bits_per_pixel > 16) {
                pxa_gpio_mode(86 | GPIO_ALT_FN_2_OUT);
                pxa_gpio_mode(87 | 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);

        if ((lccr0 & LCCR0_PAS) == 0)
                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->fdadr[0]);
        pr_debug("fdadr1 0x%08x\n", (unsigned int) fbi->fdadr[1]);
        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 */
        clk_enable(fbi->clk);

        if (fbi->lccr0 & LCCR0_LCDT)
                return;

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

        lcd_writel(fbi, FDADR0, fbi->fdadr[0]);
        lcd_writel(fbi, FDADR1, fbi->fdadr[1]);
        lcd_writel(fbi, LCCR0, fbi->reg_lccr0 | LCCR0_ENB);
}

static void pxafb_disable_controller(struct pxafb_info *fbi)
{
        uint32_t lccr0;

#ifdef CONFIG_FB_PXA_SMARTPANEL
        if (fbi->lccr0 & LCCR0_LCDT) {
                wait_for_completion_timeout(&fbi->refresh_done,
                                200 * HZ / 1000);
                return;
        }
#endif

        /* Clear LCD Status Register */
        lcd_writel(fbi, LCSR, 0xffffffff);

        lccr0 = lcd_readl(fbi, LCCR0) & ~LCCR0_LDM;
        lcd_writel(fbi, LCCR0, lccr0);
        lcd_writel(fbi, LCCR0, lccr0 | LCCR0_DIS);

        wait_for_completion_timeout(&fbi->disable_done, 200 * HZ / 1000);

        /* disable LCD controller clock */
        clk_disable(fbi->clk);
}

/*
 *  pxafb_handle_irq: Handle 'LCD DONE' interrupts.
 */
static irqreturn_t pxafb_handle_irq(int irq, void *dev_id)
{
        struct pxafb_info *fbi = dev_id;
        unsigned int lccr0, lcsr = lcd_readl(fbi, LCSR);

        if (lcsr & LCSR_LDD) {
                lccr0 = lcd_readl(fbi, LCCR0);
                lcd_writel(fbi, LCCR0, lccr0 | LCCR0_LDM);
                complete(&fbi->disable_done);
        }

#ifdef CONFIG_FB_PXA_SMARTPANEL
        if (lcsr & LCSR_CMD_INT)
                complete(&fbi->command_done);
#endif

        lcd_writel(fbi, 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;

        mutex_lock(&fbi->ctrlr_lock);

        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_lcd_power(fbi, 0);
                        pxafb_disable_controller(fbi);
                        pxafb_setup_gpio(fbi);
                        pxafb_enable_controller(fbi);
                        __pxafb_lcd_power(fbi, 1);
                }
                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;
        }
        mutex_unlock(&fbi->ctrlr_lock);
}

/*
 * Our LCD controller task (which is called when we blank or unblank)
 * via keventd.
 */
static void pxafb_task(struct work_struct *work)
{
        struct pxafb_info *fbi =
                container_of(work, struct pxafb_info, task);
        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, 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:
                pr_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;
        }
        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 __devinit pxafb_map_video_memory(struct pxafb_info *fbi)
{
        /*
         * We reserve one page for the palette, plus the size
         * of the framebuffer.
         */
        fbi->video_offset = PAGE_ALIGN(sizeof(struct pxafb_dma_buff));
        fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + fbi->video_offset);
        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 + fbi->video_offset;
                fbi->screen_dma = fbi->map_dma + fbi->video_offset;

                /*
                 * 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;

                fbi->dma_buff = (void *) fbi->map_cpu;
                fbi->dma_buff_phys = fbi->map_dma;
                fbi->palette_cpu = (u16 *) fbi->dma_buff->palette;

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

#ifdef CONFIG_FB_PXA_SMARTPANEL
                fbi->smart_cmds = (uint16_t *) fbi->dma_buff->cmd_buff;
                fbi->n_smart_cmds = 0;
#endif
        }

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

static void pxafb_decode_mode_info(struct pxafb_info *fbi,
                                   struct pxafb_mode_info *modes,
                                   unsigned int num_modes)
{
        unsigned int i, smemlen;

        pxafb_setmode(&fbi->fb.var, &modes[0]);

        for (i = 0; i < num_modes; i++) {
                smemlen = modes[i].xres * modes[i].yres * modes[i].bpp / 8;
                if (smemlen > fbi->fb.fix.smem_len)
                        fbi->fb.fix.smem_len = smemlen;
        }
}

static void pxafb_decode_mach_info(struct pxafb_info *fbi,
                                   struct pxafb_mach_info *inf)
{
        unsigned int lcd_conn = inf->lcd_conn;

        fbi->cmap_inverse       = inf->cmap_inverse;
        fbi->cmap_static        = inf->cmap_static;

        switch (lcd_conn & 0xf) {
        case LCD_TYPE_MONO_STN:
                fbi->lccr0 = LCCR0_CMS;
                break;
        case LCD_TYPE_MONO_DSTN:
                fbi->lccr0 = LCCR0_CMS | LCCR0_SDS;
                break;
        case LCD_TYPE_COLOR_STN:
                fbi->lccr0 = 0;
                break;
        case LCD_TYPE_COLOR_DSTN:
                fbi->lccr0 = LCCR0_SDS;
                break;
        case LCD_TYPE_COLOR_TFT:
                fbi->lccr0 = LCCR0_PAS;
                break;
        case LCD_TYPE_SMART_PANEL:
                fbi->lccr0 = LCCR0_LCDT | LCCR0_PAS;
                break;
        default:
                /* fall back to backward compatibility way */
                fbi->lccr0 = inf->lccr0;
                fbi->lccr3 = inf->lccr3;
                fbi->lccr4 = inf->lccr4;
                goto decode_mode;
        }

        if (lcd_conn == LCD_MONO_STN_8BPP)
                fbi->lccr0 |= LCCR0_DPD;

        fbi->lccr0 |= (lcd_conn & LCD_ALTERNATE_MAPPING) ? LCCR0_LDDALT : 0;

        fbi->lccr3 = LCCR3_Acb((inf->lcd_conn >> 10) & 0xff);
        fbi->lccr3 |= (lcd_conn & LCD_BIAS_ACTIVE_LOW) ? LCCR3_OEP : 0;
        fbi->lccr3 |= (lcd_conn & LCD_PCLK_EDGE_FALL)  ? LCCR3_PCP : 0;

decode_mode:
        pxafb_decode_mode_info(fbi, inf->modes, inf->num_modes);
}

static struct pxafb_info * __devinit 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;

        fbi->clk = clk_get(dev, "LCDCLK");
        if (IS_ERR(fbi->clk)) {
                kfree(fbi);
                return NULL;
        }

        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->state              = C_STARTUP;
        fbi->task_state         = (u_char)-1;

        pxafb_decode_mach_info(fbi, inf);

        init_waitqueue_head(&fbi->ctrlr_wait);
        INIT_WORK(&fbi->task, pxafb_task);
        mutex_init(&fbi->ctrlr_lock);
        init_completion(&fbi->disable_done);
#ifdef CONFIG_FB_PXA_SMARTPANEL
        init_completion(&fbi->command_done);
        init_completion(&fbi->refresh_done);
#endif

        return fbi;
}

#ifdef CONFIG_FB_PXA_PARAMETERS
static int __devinit parse_opt_mode(struct device *dev, const char *this_opt)
{
        struct pxafb_mach_info *inf = dev->platform_data;

        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->modes[0].xres = xres; inf->modes[0].yres = yres;
        }
        if (bpp_specified)
                switch (bpp) {
                case 1:
                case 2:
                case 4:
                case 8:
                case 16:
                        inf->modes[0].bpp = bpp;
                        dev_info(dev, "overriding bit depth: %d\n", bpp);
                        break;
                default:
                        dev_err(dev, "Depth %d is not valid\n", bpp);
                        return -EINVAL;
                }
        return 0;
}

static int __devinit parse_opt(struct device *dev, char *this_opt)
{
        struct pxafb_mach_info *inf = dev->platform_data;
        struct pxafb_mode_info *mode = &inf->modes[0];
        char s[64];

        s[0] = '\0';

        if (!strncmp(this_opt, "mode:", 5)) {
                return parse_opt_mode(dev, this_opt);
        } else if (!strncmp(this_opt, "pixclock:", 9)) {
                mode->pixclock = simple_strtoul(this_opt+9, NULL, 0);
                sprintf(s, "pixclock: %ld\n", mode->pixclock);
        } else if (!strncmp(this_opt, "left:", 5)) {
                mode->left_margin = simple_strtoul(this_opt+5, NULL, 0);
                sprintf(s, "left: %u\n", mode->left_margin);
        } else if (!strncmp(this_opt, "right:", 6)) {
                mode->right_margin = simple_strtoul(this_opt+6, NULL, 0);
                sprintf(s, "right: %u\n", mode->right_margin);
        } else if (!strncmp(this_opt, "upper:", 6)) {
                mode->upper_margin = simple_strtoul(this_opt+6, NULL, 0);
                sprintf(s, "upper: %u\n", mode->upper_margin);
        } else if (!strncmp(this_opt, "lower:", 6)) {
                mode->lower_margin = simple_strtoul(this_opt+6, NULL, 0);
                sprintf(s, "lower: %u\n", mode->lower_margin);
        } else if (!strncmp(this_opt, "hsynclen:", 9)) {
                mode->hsync_len = simple_strtoul(this_opt+9, NULL, 0);
                sprintf(s, "hsynclen: %u\n", mode->hsync_len);
        } else if (!strncmp(this_opt, "vsynclen:", 9)) {
                mode->vsync_len = simple_strtoul(this_opt+9, NULL, 0);
                sprintf(s, "vsynclen: %u\n", mode->vsync_len);
        } else if (!strncmp(this_opt, "hsync:", 6)) {
                if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
                        sprintf(s, "hsync: Active Low\n");
                        mode->sync &= ~FB_SYNC_HOR_HIGH_ACT;
                } else {
                        sprintf(s, "hsync: Active High\n");
                        mode->sync |= FB_SYNC_HOR_HIGH_ACT;
                }
        } else if (!strncmp(this_opt, "vsync:", 6)) {
                if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
                        sprintf(s, "vsync: Active Low\n");
                        mode->sync &= ~FB_SYNC_VERT_HIGH_ACT;
                } else {
                        sprintf(s, "vsync: Active High\n");
                        mode->sync |= FB_SYNC_VERT_HIGH_ACT;
                }
        } else if (!strncmp(this_opt, "dpc:", 4)) {
                if (simple_strtoul(this_opt+4, NULL, 0) == 0) {
                        sprintf(s, "double pixel clock: false\n");
                        inf->lccr3 &= ~LCCR3_DPC;
                } else {
                        sprintf(s, "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) {
                        sprintf(s, "output enable: active low\n");
                        inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnL;
                } else {
                        sprintf(s, "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) {
                        sprintf(s, "pixel clock polarity: falling edge\n");
                        inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixFlEdg;
                } else {
                        sprintf(s, "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;
        }

        if (s[0] != '\0')
                dev_info(dev, "override %s", s);

        return 0;
}

static int __devinit pxafb_parse_options(struct device *dev, char *options)
{
        char *this_opt;
        int ret;

        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) {
                ret = parse_opt(dev, this_opt);
                if (ret)
                        return ret;
        }
        return 0;
}

static char g_options[256] __devinitdata = "";

#ifndef MODULE
static int __init pxafb_setup_options(void)
{
        char *options = NULL;

        if (fb_get_options("pxafb", &options))
                return -ENODEV;

        if (options)
                strlcpy(g_options, options, sizeof(g_options));

        return 0;
}
#else
#define pxafb_setup_options()           (0)

module_param_string(options, g_options, sizeof(g_options), 0);
MODULE_PARM_DESC(options, "LCD parameters (see Documentation/fb/pxafb.txt)");
#endif

#else
#define pxafb_parse_options(...)        (0)
#define pxafb_setup_options()           (0)
#endif

#ifdef DEBUG_VAR
/* Check for various illegal bit-combinations. Currently only
 * a warning is given. */
static void __devinit pxafb_check_options(struct device *dev,
                                          struct pxafb_mach_info *inf)
{
        if (inf->lcd_conn)
                return;

        if (inf->lccr0 & LCCR0_INVALID_CONFIG_MASK)
                dev_warn(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, "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, "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, "Dual panel only valid in passive mode\n");
        if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Pas &&
             (inf->modes->upper_margin || inf->modes->lower_margin))
                dev_warn(dev, "Upper and lower margins must be 0 in "
                                "passive mode\n");
}
#else
#define pxafb_check_options(...)        do {} while (0)
#endif

static int __devinit pxafb_probe(struct platform_device *dev)
{
        struct pxafb_info *fbi;
        struct pxafb_mach_info *inf;
        struct resource *r;
        int irq, ret;

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

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

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

        pxafb_check_options(&dev->dev, inf);

        dev_dbg(&dev->dev, "got a %dx%dx%d LCD\n",
                        inf->modes->xres,
                        inf->modes->yres,
                        inf->modes->bpp);
        if (inf->modes->xres == 0 ||
            inf->modes->yres == 0 ||
            inf->modes->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) {
                /* only reason for pxafb_init_fbinfo to fail is kmalloc */
                dev_err(&dev->dev, "Failed to initialize framebuffer device\n");
                ret = -ENOMEM;
                goto failed;
        }

        r = platform_get_resource(dev, IORESOURCE_MEM, 0);
        if (r == NULL) {
                dev_err(&dev->dev, "no I/O memory resource defined\n");
                ret = -ENODEV;
                goto failed_fbi;
        }

        r = request_mem_region(r->start, r->end - r->start + 1, dev->name);
        if (r == NULL) {
                dev_err(&dev->dev, "failed to request I/O memory\n");
                ret = -EBUSY;
                goto failed_fbi;
        }

        fbi->mmio_base = ioremap(r->start, r->end - r->start + 1);
        if (fbi->mmio_base == NULL) {
                dev_err(&dev->dev, "failed to map I/O memory\n");
                ret = -EBUSY;
                goto failed_free_res;
        }

        /* 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_free_io;
        }

        irq = platform_get_irq(dev, 0);
        if (irq < 0) {
                dev_err(&dev->dev, "no IRQ defined\n");
                ret = -ENODEV;
                goto failed_free_mem;
        }

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

#ifdef CONFIG_FB_PXA_SMARTPANEL
        ret = pxafb_smart_init(fbi);
        if (ret) {
                dev_err(&dev->dev, "failed to initialize smartpanel\n");
                goto failed_free_irq;
        }
#endif
        /*
         * This makes sure that our colour bitfield
         * descriptors are correctly initialised.
         */
        ret = pxafb_check_var(&fbi->fb.var, &fbi->fb);
        if (ret) {
                dev_err(&dev->dev, "failed to get suitable mode\n");
                goto failed_free_irq;
        }

        ret = pxafb_set_par(&fbi->fb);
        if (ret) {
                dev_err(&dev->dev, "Failed to set parameters\n");
                goto failed_free_irq;
        }

        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_free_cmap;
        }

#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_free_cmap:
        if (fbi->fb.cmap.len)
                fb_dealloc_cmap(&fbi->fb.cmap);
failed_free_irq:
        free_irq(irq, fbi);
failed_free_mem:
        dma_free_writecombine(&dev->dev, fbi->map_size,
                        fbi->map_cpu, fbi->map_dma);
failed_free_io:
        iounmap(fbi->mmio_base);
failed_free_res:
        release_mem_region(r->start, r->end - r->start + 1);
failed_fbi:
        clk_put(fbi->clk);
        platform_set_drvdata(dev, NULL);
        kfree(fbi);
failed:
        return ret;
}

static int __devexit pxafb_remove(struct platform_device *dev)
{
        struct pxafb_info *fbi = platform_get_drvdata(dev);
        struct resource *r;
        int irq;
        struct fb_info *info;

        if (!fbi)
                return 0;

        info = &fbi->fb;

        unregister_framebuffer(info);

        pxafb_disable_controller(fbi);

        if (fbi->fb.cmap.len)
                fb_dealloc_cmap(&fbi->fb.cmap);

        irq = platform_get_irq(dev, 0);
        free_irq(irq, fbi);

        dma_free_writecombine(&dev->dev, fbi->map_size,
                                        fbi->map_cpu, fbi->map_dma);

        iounmap(fbi->mmio_base);

        r = platform_get_resource(dev, IORESOURCE_MEM, 0);
        release_mem_region(r->start, r->end - r->start + 1);

        clk_put(fbi->clk);
        kfree(fbi);

        return 0;
}

static struct platform_driver pxafb_driver = {
        .probe          = pxafb_probe,
        .remove         = pxafb_remove,
        .suspend        = pxafb_suspend,
        .resume         = pxafb_resume,
        .driver         = {
                .owner  = THIS_MODULE,
                .name   = "pxa2xx-fb",
        },
};

static int __init pxafb_init(void)
{
        if (pxafb_setup_options())
                return -EINVAL;

        return platform_driver_register(&pxafb_driver);
}

static void __exit pxafb_exit(void)
{
        platform_driver_unregister(&pxafb_driver);
}

module_init(pxafb_init);
module_exit(pxafb_exit);

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