drivers/video/fbdev/68328fb.c - linux - Git at Google

 /*
  *  linux/drivers/video/68328fb.c -- Low level implementation of the
  *                                   mc68x328 LCD frame buffer device
  *
  *	Copyright (C) 2003 Georges Menie
  *
  *  This driver assumes an already configured controller (e.g. from config.c)
  *  Keep the code clean of board specific initialization.
  *
  *  This code has not been tested with colors, colormap management functions
  *  are minimal (no colormap data written to the 68328 registers...)
  *
  *  initial version of this driver:
  *    Copyright (C) 1998,1999 Kenneth Albanowski <kjahds@kjahds.com>,
  *                            The Silver Hammer Group, Ltd.
  *
  *  this version is based on :
  *
  *  linux/drivers/video/vfb.c -- Virtual frame buffer device
  *
  *      Copyright (C) 2002 James Simmons
  *
  *	Copyright (C) 1997 Geert Uytterhoeven
  *
  *  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/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/mm.h>
 #include <linux/vmalloc.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/uaccess.h>
 #include <linux/fb.h>
 #include <linux/init.h>

 #if defined(CONFIG_M68VZ328)
 #include <asm/MC68VZ328.h>
 #elif defined(CONFIG_M68EZ328)
 #include <asm/MC68EZ328.h>
 #elif defined(CONFIG_M68328)
 #include <asm/MC68328.h>
 #else
 #error wrong architecture for the MC68x328 frame buffer device
 #endif

 static u_long videomemory;
 static u_long videomemorysize;

 static struct fb_info fb_info;
 static u32 mc68x328fb_pseudo_palette[16];

 static struct fb_var_screeninfo mc68x328fb_default __initdata = {
 	.red =		{ 0, 8, 0 },
       	.green =	{ 0, 8, 0 },
       	.blue =		{ 0, 8, 0 },
       	.activate =	FB_ACTIVATE_TEST,
       	.height =	-1,
       	.width =	-1,
       	.pixclock =	20000,
       	.left_margin =	64,
       	.right_margin =	64,
       	.upper_margin =	32,
       	.lower_margin =	32,
       	.hsync_len =	64,
       	.vsync_len =	2,
       	.vmode =	FB_VMODE_NONINTERLACED,
 };

 static const struct fb_fix_screeninfo mc68x328fb_fix __initconst = {
 	.id =		"68328fb",
 	.type =		FB_TYPE_PACKED_PIXELS,
 	.xpanstep =	1,
 	.ypanstep =	1,
 	.ywrapstep =	1,
 	.accel =	FB_ACCEL_NONE,
 };

     /*
      *  Interface used by the world
      */
 static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
 			 struct fb_info *info);
 static int mc68x328fb_set_par(struct fb_info *info);
 static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 			 u_int transp, struct fb_info *info);
 static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
 			   struct fb_info *info);
 static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma);

 static const struct fb_ops mc68x328fb_ops = {
 	.fb_check_var	= mc68x328fb_check_var,
 	.fb_set_par	= mc68x328fb_set_par,
 	.fb_setcolreg	= mc68x328fb_setcolreg,
 	.fb_pan_display	= mc68x328fb_pan_display,
 	.fb_fillrect	= cfb_fillrect,
 	.fb_copyarea	= cfb_copyarea,
 	.fb_imageblit	= cfb_imageblit,
 	.fb_mmap	= mc68x328fb_mmap,
 };

     /*
      *  Internal routines
      */

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

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

     /*
      *  Setting the video mode has been split into two parts.
      *  First part, xxxfb_check_var, must not write anything
      *  to hardware, it should only verify and adjust var.
      *  This means it doesn't alter par but it does use hardware
      *  data from it to check this var.
      */

 static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
 			 struct fb_info *info)
 {
 	u_long line_length;

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

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

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

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

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

 	/*
 	 * Now that we checked it we alter var. The reason being is that the video
 	 * mode passed in might not work but slight changes to it might make it
 	 * work. This way we let the user know what is acceptable.
 	 */
 	switch (var->bits_per_pixel) {
 	case 1:
 		var->red.offset = 0;
 		var->red.length = 1;
 		var->green.offset = 0;
 		var->green.length = 1;
 		var->blue.offset = 0;
 		var->blue.length = 1;
 		var->transp.offset = 0;
 		var->transp.length = 0;
 		break;
 	case 8:
 		var->red.offset = 0;
 		var->red.length = 8;
 		var->green.offset = 0;
 		var->green.length = 8;
 		var->blue.offset = 0;
 		var->blue.length = 8;
 		var->transp.offset = 0;
 		var->transp.length = 0;
 		break;
 	case 16:		/* RGBA 5551 */
 		if (var->transp.length) {
 			var->red.offset = 0;
 			var->red.length = 5;
 			var->green.offset = 5;
 			var->green.length = 5;
 			var->blue.offset = 10;
 			var->blue.length = 5;
 			var->transp.offset = 15;
 			var->transp.length = 1;
 		} else {	/* RGB 565 */
 			var->red.offset = 0;
 			var->red.length = 5;
 			var->green.offset = 5;
 			var->green.length = 6;
 			var->blue.offset = 11;
 			var->blue.length = 5;
 			var->transp.offset = 0;
 			var->transp.length = 0;
 		}
 		break;
 	case 24:		/* RGB 888 */
 		var->red.offset = 0;
 		var->red.length = 8;
 		var->green.offset = 8;
 		var->green.length = 8;
 		var->blue.offset = 16;
 		var->blue.length = 8;
 		var->transp.offset = 0;
 		var->transp.length = 0;
 		break;
 	case 32:		/* RGBA 8888 */
 		var->red.offset = 0;
 		var->red.length = 8;
 		var->green.offset = 8;
 		var->green.length = 8;
 		var->blue.offset = 16;
 		var->blue.length = 8;
 		var->transp.offset = 24;
 		var->transp.length = 8;
 		break;
 	}
 	var->red.msb_right = 0;
 	var->green.msb_right = 0;
 	var->blue.msb_right = 0;
 	var->transp.msb_right = 0;

 	return 0;
 }

 /* This routine actually sets the video mode. It's in here where we
  * the hardware state info->par and fix which can be affected by the
  * change in par. For this driver it doesn't do much.
  */
 static int mc68x328fb_set_par(struct fb_info *info)
 {
 	info->fix.line_length = get_line_length(info->var.xres_virtual,
 						info->var.bits_per_pixel);
 	return 0;
 }

     /*
      *  Set a single color register. The values supplied are already
      *  rounded down to the hardware's capabilities (according to the
      *  entries in the var structure). Return != 0 for invalid regno.
      */

 static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 			 u_int transp, struct fb_info *info)
 {
 	if (regno >= 256)	/* no. of hw registers */
 		return 1;
 	/*
 	 * Program hardware... do anything you want with transp
 	 */

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

 	/* Directcolor:
 	 *   var->{color}.offset contains start of bitfield
 	 *   var->{color}.length contains length of bitfield
 	 *   {hardwarespecific} contains width of RAMDAC
 	 *   cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset)
 	 *   RAMDAC[X] is programmed to (red, green, blue)
 	 *
 	 * Pseudocolor:
 	 *    uses offset = 0 && length = RAMDAC register width.
 	 *    var->{color}.offset is 0
 	 *    var->{color}.length contains width of DAC
 	 *    cmap is not used
 	 *    RAMDAC[X] is programmed to (red, green, blue)
 	 * Truecolor:
 	 *    does not use DAC. Usually 3 are present.
 	 *    var->{color}.offset contains start of bitfield
 	 *    var->{color}.length contains length of bitfield
 	 *    cmap is programmed to (red << red.offset) | (green << green.offset) |
 	 *                      (blue << blue.offset) | (transp << transp.offset)
 	 *    RAMDAC does not exist
 	 */
 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
 	switch (info->fix.visual) {
 	case FB_VISUAL_TRUECOLOR:
 	case FB_VISUAL_PSEUDOCOLOR:
 		red = CNVT_TOHW(red, info->var.red.length);
 		green = CNVT_TOHW(green, info->var.green.length);
 		blue = CNVT_TOHW(blue, info->var.blue.length);
 		transp = CNVT_TOHW(transp, info->var.transp.length);
 		break;
 	case FB_VISUAL_DIRECTCOLOR:
 		red = CNVT_TOHW(red, 8);	/* expect 8 bit DAC */
 		green = CNVT_TOHW(green, 8);
 		blue = CNVT_TOHW(blue, 8);
 		/* hey, there is bug in transp handling... */
 		transp = CNVT_TOHW(transp, 8);
 		break;
 	}
 #undef CNVT_TOHW
 	/* Truecolor has hardware independent palette */
 	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 		u32 v;

 		if (regno >= 16)
 			return 1;

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

     /*
      *  Pan or Wrap the Display
      *
      *  This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
      */

 static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
 			   struct fb_info *info)
 {
 	if (var->vmode & FB_VMODE_YWRAP) {
 		if (var->yoffset < 0
 		    || var->yoffset >= info->var.yres_virtual
 		    || var->xoffset)
 			return -EINVAL;
 	} else {
 		if (var->xoffset + info->var.xres > info->var.xres_virtual ||
 		    var->yoffset + info->var.yres > info->var.yres_virtual)
 			return -EINVAL;
 	}
 	info->var.xoffset = var->xoffset;
 	info->var.yoffset = var->yoffset;
 	if (var->vmode & FB_VMODE_YWRAP)
 		info->var.vmode |= FB_VMODE_YWRAP;
 	else
 		info->var.vmode &= ~FB_VMODE_YWRAP;
 	return 0;
 }

     /*
      *  Most drivers don't need their own mmap function
      */

 static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 {
 #ifndef MMU
 	/* this is uClinux (no MMU) specific code */

 	vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP);
 	vma->vm_start = videomemory;

 	return 0;
 #else
 	return -EINVAL;
 #endif
 }

 static int __init mc68x328fb_setup(char *options)
 {
 	if (!options || !*options)
 		return 1;
 	return 1;
 }

     /*
      *  Initialisation
      */

 static int __init mc68x328fb_init(void)
 {
 #ifndef MODULE
 	char *option = NULL;

 	if (fb_get_options("68328fb", &option))
 		return -ENODEV;
 	mc68x328fb_setup(option);
 #endif
 	/*
 	 *  initialize the default mode from the LCD controller registers
 	 */
 	mc68x328fb_default.xres = LXMAX;
 	mc68x328fb_default.yres = LYMAX+1;
 	mc68x328fb_default.xres_virtual = mc68x328fb_default.xres;
 	mc68x328fb_default.yres_virtual = mc68x328fb_default.yres;
 	mc68x328fb_default.bits_per_pixel = 1 + (LPICF & 0x01);
 	videomemory = LSSA;
 	videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 *
 		mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel;

 	fb_info.screen_base = (void *)videomemory;
 	fb_info.fbops = &mc68x328fb_ops;
 	fb_info.var = mc68x328fb_default;
 	fb_info.fix = mc68x328fb_fix;
 	fb_info.fix.smem_start = videomemory;
 	fb_info.fix.smem_len = videomemorysize;
 	fb_info.fix.line_length =
 		get_line_length(mc68x328fb_default.xres_virtual, mc68x328fb_default.bits_per_pixel);
 	fb_info.fix.visual = (mc68x328fb_default.bits_per_pixel) == 1 ?
 		FB_VISUAL_MONO10 : FB_VISUAL_PSEUDOCOLOR;
 	if (fb_info.var.bits_per_pixel == 1) {
 		fb_info.var.red.length = fb_info.var.green.length = fb_info.var.blue.length = 1;
 		fb_info.var.red.offset = fb_info.var.green.offset = fb_info.var.blue.offset = 0;
 	}
 	fb_info.pseudo_palette = &mc68x328fb_pseudo_palette;
 	fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;

 	if (fb_alloc_cmap(&fb_info.cmap, 256, 0))
 		return -ENOMEM;

 	if (register_framebuffer(&fb_info) < 0) {
 		fb_dealloc_cmap(&fb_info.cmap);
 		return -EINVAL;
 	}

 	fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id);
 	fb_info(&fb_info, "%dx%dx%d at 0x%08lx\n",
 		mc68x328fb_default.xres_virtual,
 		mc68x328fb_default.yres_virtual,
 		1 << mc68x328fb_default.bits_per_pixel, videomemory);

 	return 0;
 }

 module_init(mc68x328fb_init);

 #ifdef MODULE

 static void __exit mc68x328fb_cleanup(void)
 {
 	unregister_framebuffer(&fb_info);
 	fb_dealloc_cmap(&fb_info.cmap);
 }

 module_exit(mc68x328fb_cleanup);

 MODULE_LICENSE("GPL");
 #endif				/* MODULE */
	/*
	* linux/drivers/video/68328fb.c -- Low level implementation of the
	* mc68x328 LCD frame buffer device
	*
	* Copyright (C) 2003 Georges Menie
	*
	* This driver assumes an already configured controller (e.g. from config.c)
	* Keep the code clean of board specific initialization.
	*
	* This code has not been tested with colors, colormap management functions
	* are minimal (no colormap data written to the 68328 registers...)
	*
	* initial version of this driver:
	* Copyright (C) 1998,1999 Kenneth Albanowski <kjahds@kjahds.com>,
	* The Silver Hammer Group, Ltd.
	*
	* this version is based on :
	*
	* linux/drivers/video/vfb.c -- Virtual frame buffer device
	*
	* Copyright (C) 2002 James Simmons
	*
	* Copyright (C) 1997 Geert Uytterhoeven
	*
	* 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/module.h>
	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/string.h>
	#include <linux/mm.h>
	#include <linux/vmalloc.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/uaccess.h>
	#include <linux/fb.h>
	#include <linux/init.h>

	#if defined(CONFIG_M68VZ328)
	#include <asm/MC68VZ328.h>
	#elif defined(CONFIG_M68EZ328)
	#include <asm/MC68EZ328.h>
	#elif defined(CONFIG_M68328)
	#include <asm/MC68328.h>
	#else
	#error wrong architecture for the MC68x328 frame buffer device
	#endif

	static u_long videomemory;
	static u_long videomemorysize;

	static struct fb_info fb_info;
	static u32 mc68x328fb_pseudo_palette[16];

	static struct fb_var_screeninfo mc68x328fb_default __initdata = {
	.red = { 0, 8, 0 },
	.green = { 0, 8, 0 },
	.blue = { 0, 8, 0 },
	.activate = FB_ACTIVATE_TEST,
	.height = -1,
	.width = -1,
	.pixclock = 20000,
	.left_margin = 64,
	.right_margin = 64,
	.upper_margin = 32,
	.lower_margin = 32,
	.hsync_len = 64,
	.vsync_len = 2,
	.vmode = FB_VMODE_NONINTERLACED,
	};

	static const struct fb_fix_screeninfo mc68x328fb_fix __initconst = {
	.id = "68328fb",
	.type = FB_TYPE_PACKED_PIXELS,
	.xpanstep = 1,
	.ypanstep = 1,
	.ywrapstep = 1,
	.accel = FB_ACCEL_NONE,
	};

	/*
	* Interface used by the world
	*/
	static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
	struct fb_info *info);
	static int mc68x328fb_set_par(struct fb_info *info);
	static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
	u_int transp, struct fb_info *info);
	static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
	struct fb_info *info);
	static int mc68x328fb_mmap(struct fb_info info, struct vm_area_struct vma);

	static const struct fb_ops mc68x328fb_ops = {
	.fb_check_var = mc68x328fb_check_var,
	.fb_set_par = mc68x328fb_set_par,
	.fb_setcolreg = mc68x328fb_setcolreg,
	.fb_pan_display = mc68x328fb_pan_display,
	.fb_fillrect = cfb_fillrect,
	.fb_copyarea = cfb_copyarea,
	.fb_imageblit = cfb_imageblit,
	.fb_mmap = mc68x328fb_mmap,
	};

	/*
	* Internal routines
	*/

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

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

	/*
	* Setting the video mode has been split into two parts.
	* First part, xxxfb_check_var, must not write anything
	* to hardware, it should only verify and adjust var.
	* This means it doesn't alter par but it does use hardware
	* data from it to check this var.
	*/

	static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
	struct fb_info *info)
	{
	u_long line_length;

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

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

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

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

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

	/*
	* Now that we checked it we alter var. The reason being is that the video
	* mode passed in might not work but slight changes to it might make it
	* work. This way we let the user know what is acceptable.
	*/
	switch (var->bits_per_pixel) {
	case 1:
	var->red.offset = 0;
	var->red.length = 1;
	var->green.offset = 0;
	var->green.length = 1;
	var->blue.offset = 0;
	var->blue.length = 1;
	var->transp.offset = 0;
	var->transp.length = 0;
	break;
	case 8:
	var->red.offset = 0;
	var->red.length = 8;
	var->green.offset = 0;
	var->green.length = 8;
	var->blue.offset = 0;
	var->blue.length = 8;
	var->transp.offset = 0;
	var->transp.length = 0;
	break;
	case 16: /* RGBA 5551 */
	if (var->transp.length) {
	var->red.offset = 0;
	var->red.length = 5;
	var->green.offset = 5;
	var->green.length = 5;
	var->blue.offset = 10;
	var->blue.length = 5;
	var->transp.offset = 15;
	var->transp.length = 1;
	} else { /* RGB 565 */
	var->red.offset = 0;
	var->red.length = 5;
	var->green.offset = 5;
	var->green.length = 6;
	var->blue.offset = 11;
	var->blue.length = 5;
	var->transp.offset = 0;
	var->transp.length = 0;
	}
	break;
	case 24: /* RGB 888 */
	var->red.offset = 0;
	var->red.length = 8;
	var->green.offset = 8;
	var->green.length = 8;
	var->blue.offset = 16;
	var->blue.length = 8;
	var->transp.offset = 0;
	var->transp.length = 0;
	break;
	case 32: /* RGBA 8888 */
	var->red.offset = 0;
	var->red.length = 8;
	var->green.offset = 8;
	var->green.length = 8;
	var->blue.offset = 16;
	var->blue.length = 8;
	var->transp.offset = 24;
	var->transp.length = 8;
	break;
	}
	var->red.msb_right = 0;
	var->green.msb_right = 0;
	var->blue.msb_right = 0;
	var->transp.msb_right = 0;

	return 0;
	}

	/* This routine actually sets the video mode. It's in here where we
	* the hardware state info->par and fix which can be affected by the
	* change in par. For this driver it doesn't do much.
	*/
	static int mc68x328fb_set_par(struct fb_info *info)
	{
	info->fix.line_length = get_line_length(info->var.xres_virtual,
	info->var.bits_per_pixel);
	return 0;
	}

	/*
	* Set a single color register. The values supplied are already
	* rounded down to the hardware's capabilities (according to the
	* entries in the var structure). Return != 0 for invalid regno.
	*/

	static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
	u_int transp, struct fb_info *info)
	{
	if (regno >= 256) /* no. of hw registers */
	return 1;
	/*
	* Program hardware... do anything you want with transp
	*/

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

	/* Directcolor:
	* var->{color}.offset contains start of bitfield
	* var->{color}.length contains length of bitfield
	* {hardwarespecific} contains width of RAMDAC
	* cmap[X] is programmed to (X << red.offset) \| (X << green.offset) \| (X << blue.offset)
	* RAMDAC[X] is programmed to (red, green, blue)
	*
	* Pseudocolor:
	* uses offset = 0 && length = RAMDAC register width.
	* var->{color}.offset is 0
	* var->{color}.length contains width of DAC
	* cmap is not used
	* RAMDAC[X] is programmed to (red, green, blue)
	* Truecolor:
	* does not use DAC. Usually 3 are present.
	* var->{color}.offset contains start of bitfield
	* var->{color}.length contains length of bitfield
	* cmap is programmed to (red << red.offset) \| (green << green.offset) \|
	* (blue << blue.offset) \| (transp << transp.offset)
	* RAMDAC does not exist
	*/
	#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
	switch (info->fix.visual) {
	case FB_VISUAL_TRUECOLOR:
	case FB_VISUAL_PSEUDOCOLOR:
	red = CNVT_TOHW(red, info->var.red.length);
	green = CNVT_TOHW(green, info->var.green.length);
	blue = CNVT_TOHW(blue, info->var.blue.length);
	transp = CNVT_TOHW(transp, info->var.transp.length);
	break;
	case FB_VISUAL_DIRECTCOLOR:
	red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */
	green = CNVT_TOHW(green, 8);
	blue = CNVT_TOHW(blue, 8);
	/* hey, there is bug in transp handling... */
	transp = CNVT_TOHW(transp, 8);
	break;
	}
	#undef CNVT_TOHW
	/* Truecolor has hardware independent palette */
	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
	u32 v;

	if (regno >= 16)
	return 1;

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

	/*
	* Pan or Wrap the Display
	*
	* This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
	*/

	static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
	struct fb_info *info)
	{
	if (var->vmode & FB_VMODE_YWRAP) {
	if (var->yoffset < 0
	\|\| var->yoffset >= info->var.yres_virtual
	\|\| var->xoffset)
	return -EINVAL;
	} else {
	if (var->xoffset + info->var.xres > info->var.xres_virtual \|\|
	var->yoffset + info->var.yres > info->var.yres_virtual)
	return -EINVAL;
	}
	info->var.xoffset = var->xoffset;
	info->var.yoffset = var->yoffset;
	if (var->vmode & FB_VMODE_YWRAP)
	info->var.vmode \|= FB_VMODE_YWRAP;
	else
	info->var.vmode &= ~FB_VMODE_YWRAP;
	return 0;
	}

	/*
	* Most drivers don't need their own mmap function
	*/

	static int mc68x328fb_mmap(struct fb_info info, struct vm_area_struct vma)
	{
	#ifndef MMU
	/* this is uClinux (no MMU) specific code */

	vm_flags_set(vma, VM_DONTEXPAND \| VM_DONTDUMP);
	vma->vm_start = videomemory;

	return 0;
	#else
	return -EINVAL;
	#endif
	}

	static int __init mc68x328fb_setup(char *options)
	{
	if (!options \|\| !*options)
	return 1;
	return 1;
	}

	/*
	* Initialisation
	*/

	static int __init mc68x328fb_init(void)
	{
	#ifndef MODULE
	char *option = NULL;

	if (fb_get_options("68328fb", &option))
	return -ENODEV;
	mc68x328fb_setup(option);
	#endif
	/*
	* initialize the default mode from the LCD controller registers
	*/
	mc68x328fb_default.xres = LXMAX;
	mc68x328fb_default.yres = LYMAX+1;
	mc68x328fb_default.xres_virtual = mc68x328fb_default.xres;
	mc68x328fb_default.yres_virtual = mc68x328fb_default.yres;
	mc68x328fb_default.bits_per_pixel = 1 + (LPICF & 0x01);
	videomemory = LSSA;
	videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 *
	mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel;

	fb_info.screen_base = (void *)videomemory;
	fb_info.fbops = &mc68x328fb_ops;
	fb_info.var = mc68x328fb_default;
	fb_info.fix = mc68x328fb_fix;
	fb_info.fix.smem_start = videomemory;
	fb_info.fix.smem_len = videomemorysize;
	fb_info.fix.line_length =
	get_line_length(mc68x328fb_default.xres_virtual, mc68x328fb_default.bits_per_pixel);
	fb_info.fix.visual = (mc68x328fb_default.bits_per_pixel) == 1 ?
	FB_VISUAL_MONO10 : FB_VISUAL_PSEUDOCOLOR;
	if (fb_info.var.bits_per_pixel == 1) {
	fb_info.var.red.length = fb_info.var.green.length = fb_info.var.blue.length = 1;
	fb_info.var.red.offset = fb_info.var.green.offset = fb_info.var.blue.offset = 0;
	}
	fb_info.pseudo_palette = &mc68x328fb_pseudo_palette;
	fb_info.flags = FBINFO_DEFAULT \| FBINFO_HWACCEL_YPAN;

	if (fb_alloc_cmap(&fb_info.cmap, 256, 0))
	return -ENOMEM;

	if (register_framebuffer(&fb_info) < 0) {
	fb_dealloc_cmap(&fb_info.cmap);
	return -EINVAL;
	}

	fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id);
	fb_info(&fb_info, "%dx%dx%d at 0x%08lx\n",
	mc68x328fb_default.xres_virtual,
	mc68x328fb_default.yres_virtual,
	1 << mc68x328fb_default.bits_per_pixel, videomemory);

	return 0;
	}

	module_init(mc68x328fb_init);

	#ifdef MODULE

	static void __exit mc68x328fb_cleanup(void)
	{
	unregister_framebuffer(&fb_info);
	fb_dealloc_cmap(&fb_info.cmap);
	}

	module_exit(mc68x328fb_cleanup);

	MODULE_LICENSE("GPL");
	#endif /* MODULE */