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/*

 *  Driver for AT91/AT32 LCD Controller

 *

 *  Copyright (C) 2007 Atmel Corporation

 *

 * 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.

 */

#include <linux/kernel.h>

#include <linux/platform_device.h>

#include <linux/dma-mapping.h>

#include <linux/interrupt.h>

#include <linux/clk.h>

#include <linux/fb.h>

#include <linux/init.h>

#include <linux/delay.h>

#include <asm/arch/board.h>

#include <asm/arch/cpu.h>

#include <asm/arch/gpio.h>

#include <video/atmel_lcdc.h>

#define lcdc_readl(sinfo, reg)          __raw_readl((sinfo)->mmio+(reg))

#define lcdc_writel(sinfo, reg, val)    __raw_writel((val), (sinfo)->mmio+(reg))

/* configurable parameters */

#define ATMEL_LCDC_CVAL_DEFAULT         0xc8

#define ATMEL_LCDC_DMA_BURST_LEN        8

#if defined(CONFIG_ARCH_AT91SAM9263)

#define ATMEL_LCDC_FIFO_SIZE            2048

#else

#define ATMEL_LCDC_FIFO_SIZE            512

#endif

#if defined(CONFIG_ARCH_AT91)

#define ATMEL_LCDFB_FBINFO_DEFAULT      FBINFO_DEFAULT

static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,

                                        struct fb_var_screeninfo *var)

{

}

#elif defined(CONFIG_AVR32)

#define ATMEL_LCDFB_FBINFO_DEFAULT      (FBINFO_DEFAULT \

                                        | FBINFO_PARTIAL_PAN_OK \

                                        | FBINFO_HWACCEL_XPAN \

                                        | FBINFO_HWACCEL_YPAN)

static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,

                                     struct fb_var_screeninfo *var)

{

        u32 dma2dcfg;

        u32 pixeloff;

        pixeloff = (var->xoffset * var->bits_per_pixel) & 0x1f;

        dma2dcfg = ((var->xres_virtual - var->xres) * var->bits_per_pixel) / 8;

        dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;

        lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);

        /* Update configuration */

        lcdc_writel(sinfo, ATMEL_LCDC_DMACON,

                    lcdc_readl(sinfo, ATMEL_LCDC_DMACON)

                    | ATMEL_LCDC_DMAUPDT);

}

#endif

static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = {

        .type           = FB_TYPE_PACKED_PIXELS,

        .visual         = FB_VISUAL_TRUECOLOR,

        .xpanstep       = 0,

        .ypanstep       = 0,

        .ywrapstep      = 0,

        .accel          = FB_ACCEL_NONE,

};

static unsigned long compute_hozval(unsigned long xres, unsigned long lcdcon2)

{

        unsigned long value;

        if (!(cpu_is_at91sam9261() || cpu_is_at32ap7000()))

                return xres;

        value = xres;

        if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {

                /* STN display */

                if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {

                        value *= 3;

                }

                if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4

                   || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8

                      && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL ))

                        value = DIV_ROUND_UP(value, 4);

                else

                        value = DIV_ROUND_UP(value, 8);

        }

        return value;

}

static void atmel_lcdfb_update_dma(struct fb_info *info,

                               struct fb_var_screeninfo *var)

{

        struct atmel_lcdfb_info *sinfo = info->par;

        struct fb_fix_screeninfo *fix = &info->fix;

        unsigned long dma_addr;

        dma_addr = (fix->smem_start + var->yoffset * fix->line_length

                    + var->xoffset * var->bits_per_pixel / 8);

        dma_addr &= ~3UL;

        /* Set framebuffer DMA base address and pixel offset */

        lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);

        atmel_lcdfb_update_dma2d(sinfo, var);

}

static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)

{

        struct fb_info *info = sinfo->info;

        dma_free_writecombine(info->device, info->fix.smem_len,

                                info->screen_base, info->fix.smem_start);

}

/**

 *      atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory

 *      @sinfo: the frame buffer to allocate memory for

 */

static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)

{

        struct fb_info *info = sinfo->info;

        struct fb_var_screeninfo *var = &info->var;

        info->fix.smem_len = (var->xres_virtual * var->yres_virtual

                            * ((var->bits_per_pixel + 7) / 8));

        info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len,

                                        (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL);

        if (!info->screen_base) {

                return -ENOMEM;

        }

        return 0;

}

/**

 *      atmel_lcdfb_check_var - Validates a var passed in.

 *      @var: frame buffer variable screen structure

 *      @info: frame buffer structure that represents a single frame buffer

 *

 *      Checks to see if the hardware supports the state requested by

 *      var passed in. This function does not alter the hardware

 *      state!!!  This means the data stored in struct fb_info and

 *      struct atmel_lcdfb_info do not change. This includes the var

 *      inside of struct fb_info.  Do NOT change these. This function

 *      can be called on its own if we intent to only test a mode and

 *      not actually set it. The stuff in modedb.c is a example of

 *      this. If the var passed in is slightly off by what the

 *      hardware can support then we alter the var PASSED in to what

 *      we can do. If the hardware doesn't support mode change a

 *      -EINVAL will be returned by the upper layers. You don't need

 *      to implement this function then. If you hardware doesn't

 *      support changing the resolution then this function is not

 *      needed. In this case the driver would just provide a var that

 *      represents the static state the screen is in.

 *

 *      Returns negative errno on error, or zero on success.

 */

static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,

                             struct fb_info *info)

{

        struct device *dev = info->device;

        struct atmel_lcdfb_info *sinfo = info->par;

        unsigned long clk_value_khz;

        clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;

        dev_dbg(dev, "%s:\n", __func__);

        dev_dbg(dev, "  resolution: %ux%u\n", var->xres, var->yres);

        dev_dbg(dev, "  pixclk:     %lu KHz\n", PICOS2KHZ(var->pixclock));

        dev_dbg(dev, "  bpp:        %u\n", var->bits_per_pixel);

        dev_dbg(dev, "  clk:        %lu KHz\n", clk_value_khz);

        if ((PICOS2KHZ(var->pixclock) * var->bits_per_pixel / 8) > clk_value_khz) {

                dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));

                return -EINVAL;

        }

        /* Force same alignment for each line */

        var->xres = (var->xres + 3) & ~3UL;

        var->xres_virtual = (var->xres_virtual + 3) & ~3UL;

        var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;

        var->transp.msb_right = 0;

        var->transp.offset = var->transp.length = 0;

        var->xoffset = var->yoffset = 0;

        switch (var->bits_per_pixel) {

        case 1:

        case 2:

        case 4:

        case 8:

                var->red.offset = var->green.offset = var->blue.offset = 0;

                var->red.length = var->green.length = var->blue.length

                        = var->bits_per_pixel;

                break;

        case 15:

        case 16:

                var->red.offset = 0;

                var->green.offset = 5;

                var->blue.offset = 10;

                var->red.length = var->green.length = var->blue.length = 5;

                break;

        case 32:

                var->transp.offset = 24;

                var->transp.length = 8;

                /* fall through */

        case 24:

                var->red.offset = 0;

                var->green.offset = 8;

                var->blue.offset = 16;

                var->red.length = var->green.length = var->blue.length = 8;

                break;

        default:

                dev_err(dev, "color depth %d not supported\n",

                                        var->bits_per_pixel);

                return -EINVAL;

        }

        return 0;

}

/**

 *      atmel_lcdfb_set_par - Alters the hardware state.

 *      @info: frame buffer structure that represents a single frame buffer

 *

 *      Using the fb_var_screeninfo in fb_info we set the resolution

 *      of the this particular framebuffer. This function alters the

 *      par AND the fb_fix_screeninfo stored in fb_info. It doesn't

 *      not alter var in fb_info since we are using that data. This

 *      means we depend on the data in var inside fb_info to be

 *      supported by the hardware.  atmel_lcdfb_check_var is always called

 *      before atmel_lcdfb_set_par to ensure this.  Again if you can't

 *      change the resolution you don't need this function.

 *

 */

static int atmel_lcdfb_set_par(struct fb_info *info)

{

        struct atmel_lcdfb_info *sinfo = info->par;

        unsigned long hozval_linesz;

        unsigned long value;

        unsigned long clk_value_khz;

        unsigned long bits_per_line;

        dev_dbg(info->device, "%s:\n", __func__);

        dev_dbg(info->device, "  * resolution: %ux%u (%ux%u virtual)\n",

                 info->var.xres, info->var.yres,

                 info->var.xres_virtual, info->var.yres_virtual);

        /* Turn off the LCD controller and the DMA controller */

        lcdc_writel(sinfo, ATMEL_LCDC_PWRCON, sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET);

        /* Wait for the LCDC core to become idle */

        while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)

                msleep(10);

        lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);

        if (info->var.bits_per_pixel == 1)

                info->fix.visual = FB_VISUAL_MONO01;

        else if (info->var.bits_per_pixel <= 8)

                info->fix.visual = FB_VISUAL_PSEUDOCOLOR;

        else

                info->fix.visual = FB_VISUAL_TRUECOLOR;

        bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel;

        info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8);

        /* Re-initialize the DMA engine... */

        dev_dbg(info->device, "  * update DMA engine\n");

        atmel_lcdfb_update_dma(info, &info->var);

        /* ...set frame size and burst length = 8 words (?) */

        value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32;

        value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET);

        lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value);

        /* Now, the LCDC core... */

        /* Set pixel clock */

        clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;

        value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));

        value = (value / 2) - 1;

        dev_dbg(info->device, "  * programming CLKVAL = 0x%08lx\n", value);

        if (value <= 0) {

                dev_notice(info->device, "Bypassing pixel clock divider\n");

                lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS);

        } else {

                lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, value << ATMEL_LCDC_CLKVAL_OFFSET);

                info->var.pixclock = KHZ2PICOS(clk_value_khz / (2 * (value + 1)));

                dev_dbg(info->device, "  updated pixclk:     %lu KHz\n",

                                        PICOS2KHZ(info->var.pixclock));

        }

        /* Initialize control register 2 */

        value = sinfo->default_lcdcon2;

        if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))

                value |= ATMEL_LCDC_INVLINE_INVERTED;

        if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))

                value |= ATMEL_LCDC_INVFRAME_INVERTED;

        switch (info->var.bits_per_pixel) {

                case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break;

                case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break;

                case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break;

                case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break;

                case 15: /* fall through */

                case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break;

                case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break;

                case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break;

                default: BUG(); break;

        }

        dev_dbg(info->device, "  * LCDCON2 = %08lx\n", value);

        lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);

        /* Vertical timing */

        value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET;

        value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET;

        value |= info->var.lower_margin;

        dev_dbg(info->device, "  * LCDTIM1 = %08lx\n", value);

        lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value);

        /* Horizontal timing */

        value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET;

        value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET;

        value |= (info->var.left_margin - 1);

        dev_dbg(info->device, "  * LCDTIM2 = %08lx\n", value);

        lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value);

        /* Horizontal value (aka line size) */

        hozval_linesz = compute_hozval(info->var.xres,

                                        lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2));

        /* Display size */

        value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET;

        value |= info->var.yres - 1;

        dev_dbg(info->device, "  * LCDFRMCFG = %08lx\n", value);

        lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value);

        /* FIFO Threshold: Use formula from data sheet */

        value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3);

        lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value);

        /* Toggle LCD_MODE every frame */

        lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);

        /* Disable all interrupts */

        lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);

        /* Set contrast */

        value = ATMEL_LCDC_PS_DIV8 | ATMEL_LCDC_POL_POSITIVE | ATMEL_LCDC_ENA_PWMENABLE;

        lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, value);

        lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT);

        /* ...wait for DMA engine to become idle... */

        while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)

                msleep(10);

        dev_dbg(info->device, "  * re-enable DMA engine\n");

        /* ...and enable it with updated configuration */

        lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon);

        dev_dbg(info->device, "  * re-enable LCDC core\n");

        lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,

                (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR);

        dev_dbg(info->device, "  * DONE\n");

        return 0;

}

static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)

{

        chan &= 0xffff;

        chan >>= 16 - bf->length;

        return chan << bf->offset;

}

/**

 *      atmel_lcdfb_setcolreg - Optional function. Sets a color register.

 *      @regno: Which register in the CLUT we are programming

 *      @red: The red value which can be up to 16 bits wide

 *      @green: The green value which can be up to 16 bits wide

 *      @blue:  The blue value which can be up to 16 bits wide.

 *      @transp: If supported the alpha value which can be up to 16 bits wide.

 *      @info: frame buffer info structure

 *

 *      Set a single color register. The values supplied have a 16 bit

 *      magnitude which needs to be scaled in this function for the hardware.

 *      Things to take into consideration are how many color registers, if

 *      any, are supported with the current color visual. With truecolor mode

 *      no color palettes are supported. Here a psuedo palette is created

 *      which we store the value in pseudo_palette in struct fb_info. For

 *      pseudocolor mode we have a limited color palette. To deal with this

 *      we can program what color is displayed for a particular pixel value.

 *      DirectColor is similar in that we can program each color field. If

 *      we have a static colormap we don't need to implement this function.

 *

 *      Returns negative errno on error, or zero on success. In an

 *      ideal world, this would have been the case, but as it turns

 *      out, the other drivers return 1 on failure, so that's what

 *      we're going to do.

 */

static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red,

                             unsigned int green, unsigned int blue,

                             unsigned int transp, struct fb_info *info)

{

        struct atmel_lcdfb_info *sinfo = info->par;

        unsigned int val;

        u32 *pal;

        int ret = 1;

        if (info->var.grayscale)

                red = green = blue = (19595 * red + 38470 * green

                                      + 7471 * blue) >> 16;

        switch (info->fix.visual) {

        case FB_VISUAL_TRUECOLOR:

                if (regno < 16) {

                        pal = info->pseudo_palette;

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

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

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

                        pal[regno] = val;

                        ret = 0;

                }

                break;

        case FB_VISUAL_PSEUDOCOLOR:

                if (regno < 256) {

                        val  = ((red   >> 11) & 0x001f);

                        val |= ((green >>  6) & 0x03e0);

                        val |= ((blue  >>  1) & 0x7c00);

                        /*

                         * TODO: intensity bit. Maybe something like

                         *   ~(red[10] ^ green[10] ^ blue[10]) & 1

                         */

                        lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);

                        ret = 0;

                }

                break;

        case FB_VISUAL_MONO01:

                if (regno < 2) {

                        val = (regno == 0) ? 0x00 : 0x1F;

                        lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);

                        ret = 0;

                }

                break;

        }

        return ret;

}

static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,

                               struct fb_info *info)

{

        dev_dbg(info->device, "%s\n", __func__);

        atmel_lcdfb_update_dma(info, var);

        return 0;

}

static struct fb_ops atmel_lcdfb_ops = {

        .owner          = THIS_MODULE,

        .fb_check_var   = atmel_lcdfb_check_var,

        .fb_set_par     = atmel_lcdfb_set_par,

        .fb_setcolreg   = atmel_lcdfb_setcolreg,

        .fb_pan_display = atmel_lcdfb_pan_display,

        .fb_fillrect    = cfb_fillrect,

        .fb_copyarea    = cfb_copyarea,

        .fb_imageblit   = cfb_imageblit,

};

static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)

{

        struct fb_info *info = dev_id;

        struct atmel_lcdfb_info *sinfo = info->par;

        u32 status;

        status = lcdc_readl(sinfo, ATMEL_LCDC_ISR);

        lcdc_writel(sinfo, ATMEL_LCDC_IDR, status);

        return IRQ_HANDLED;

}

static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)

{

        struct fb_info *info = sinfo->info;

        int ret = 0;

        memset_io(info->screen_base, 0, info->fix.smem_len);

        info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;

        dev_info(info->device,

               "%luKiB frame buffer at %08lx (mapped at %p)\n",

               (unsigned long)info->fix.smem_len / 1024,

               (unsigned long)info->fix.smem_start,

               info->screen_base);

        /* Allocate colormap */

        ret = fb_alloc_cmap(&info->cmap, 256, 0);

        if (ret < 0)

                dev_err(info->device, "Alloc color map failed\n");

        return ret;

}

static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)

{

        if (sinfo->bus_clk)

                clk_enable(sinfo->bus_clk);

        clk_enable(sinfo->lcdc_clk);

}

static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)

{

        if (sinfo->bus_clk)

                clk_disable(sinfo->bus_clk);

        clk_disable(sinfo->lcdc_clk);

}

static int __init atmel_lcdfb_probe(struct platform_device *pdev)

{

        struct device *dev = &pdev->dev;

        struct fb_info *info;

        struct atmel_lcdfb_info *sinfo;

        struct atmel_lcdfb_info *pdata_sinfo;

        struct resource *regs = NULL;

        struct resource *map = NULL;

        int ret;

        dev_dbg(dev, "%s BEGIN\n", __func__);

        ret = -ENOMEM;

        info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);

        if (!info) {

                dev_err(dev, "cannot allocate memory\n");

                goto out;

        }

        sinfo = info->par;

        if (dev->platform_data) {

                pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data;

                sinfo->default_bpp = pdata_sinfo->default_bpp;

                sinfo->default_dmacon = pdata_sinfo->default_dmacon;

                sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2;

                sinfo->default_monspecs = pdata_sinfo->default_monspecs;

                sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control;

                sinfo->guard_time = pdata_sinfo->guard_time;

        } else {

                dev_err(dev, "cannot get default configuration\n");

                goto free_info;

        }

        sinfo->info = info;

        sinfo->pdev = pdev;

        strcpy(info->fix.id, sinfo->pdev->name);

        info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;

        info->pseudo_palette = sinfo->pseudo_palette;

        info->fbops = &atmel_lcdfb_ops;

        memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs));

        info->fix = atmel_lcdfb_fix;

        /* Enable LCDC Clocks */

        if (cpu_is_at91sam9261() || cpu_is_at32ap7000()) {

                sinfo->bus_clk = clk_get(dev, "hck1");

                if (IS_ERR(sinfo->bus_clk)) {

                        ret = PTR_ERR(sinfo->bus_clk);

                        goto free_info;

                }

        }

        sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");

        if (IS_ERR(sinfo->lcdc_clk)) {

                ret = PTR_ERR(sinfo->lcdc_clk);

                goto put_bus_clk;

        }

        atmel_lcdfb_start_clock(sinfo);

        ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb,

                        info->monspecs.modedb_len, info->monspecs.modedb,

                        sinfo->default_bpp);

        if (!ret) {

                dev_err(dev, "no suitable video mode found\n");

                goto stop_clk;

        }

        regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);

        if (!regs) {

                dev_err(dev, "resources unusable\n");

                ret = -ENXIO;

                goto stop_clk;

        }

        sinfo->irq_base = platform_get_irq(pdev, 0);

        if (sinfo->irq_base < 0) {

                dev_err(dev, "unable to get irq\n");

                ret = sinfo->irq_base;

                goto stop_clk;

        }

        /* Initialize video memory */

        map = platform_get_resource(pdev, IORESOURCE_MEM, 1);

        if (map) {

                /* use a pre-allocated memory buffer */

                info->fix.smem_start = map->start;

                info->fix.smem_len = map->end - map->start + 1;

                if (!request_mem_region(info->fix.smem_start,

                                        info->fix.smem_len, pdev->name)) {

                        ret = -EBUSY;

                        goto stop_clk;

                }

                info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);

                if (!info->screen_base)

                        goto release_intmem;

        } else {

                /* alocate memory buffer */

                ret = atmel_lcdfb_alloc_video_memory(sinfo);

                if (ret < 0) {