[linux.git] / drivers / video / 68328fb.c

/*
 *  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 <[email protected]>,
 *                            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/tty.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <asm/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

#if defined(CONFIG_FB_68328_INVERT)
#define MC68X328FB_MONO_VISUAL FB_VISUAL_MONO01
#else
#define MC68X328FB_MONO_VISUAL FB_VISUAL_MONO10
#endif

static u_long videomemory;
static u_long videomemorysize;

static struct fb_info fb_info;
static u32 mc68x328fb_pseudo_palette[17];

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

    /*
     *  Interface used by the world
     */
int mc68x328fb_init(void);
int mc68x328fb_setup(char *);

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 file *file,
		    struct vm_area_struct *vma);

static 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 widht 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 + var->xres > info->var.xres_virtual ||
		    var->yoffset + 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 file *file,
		    struct vm_area_struct *vma)
{
#ifndef MMU
	/* this is uClinux (no MMU) specific code */

	vma->vm_flags |= VM_RESERVED;
	vma->vm_start = videomemory;

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

int __init mc68x328fb_setup(char *options)
{
#if 0
	char *this_opt;
#endif

	if (!options || !*options)
		return 1;
#if 0
	while ((this_opt = strsep(&options, ",")) != NULL) {
		if (!*this_opt)
			continue;
		if (!strncmp(this_opt, "disable", 7))
			mc68x328fb_enable = 0;
	}
#endif
	return 1;
}

    /*
     *  Initialisation
     */

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 ?
		MC68X328FB_MONO_VISUAL : 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;

	fb_alloc_cmap(&fb_info.cmap, 256, 0);

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

	printk(KERN_INFO
		"fb%d: %s frame buffer device\n", fb_info.node,	fb_info.fix.id);
	printk(KERN_INFO
		"fb%d: %dx%dx%d at 0x%08lx\n", fb_info.node,
		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);
}

module_exit(mc68x328fb_cleanup);

MODULE_LICENSE("GPL");
#endif				/* MODULE */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/video/68328fb.c -- Low level implementation of the
	3	* mc68x328 LCD frame buffer device
	4	*
	5	* Copyright (C) 2003 Georges Menie
	6	*
	7	* This driver assumes an already configured controller (e.g. from config.c)
	8	* Keep the code clean of board specific initialization.
	9	*
	10	* This code has not been tested with colors, colormap management functions
	11	* are minimal (no colormap data written to the 68328 registers...)
	12	*
	13	* initial version of this driver:
	14	* Copyright (C) 1998,1999 Kenneth Albanowski <[email protected]>,
	15	* The Silver Hammer Group, Ltd.
	16	*
	17	* this version is based on :
	18	*
	19	* linux/drivers/video/vfb.c -- Virtual frame buffer device
	20	*
	21	* Copyright (C) 2002 James Simmons
	22	*
	23	* Copyright (C) 1997 Geert Uytterhoeven
	24	*
	25	* This file is subject to the terms and conditions of the GNU General Public
	26	* License. See the file COPYING in the main directory of this archive for
	27	* more details.
	28	*/
	29
	30	#include <linux/module.h>
	31	#include <linux/kernel.h>
	32	#include <linux/errno.h>
	33	#include <linux/string.h>
	34	#include <linux/mm.h>
	35	#include <linux/tty.h>
	36	#include <linux/slab.h>
	37	#include <linux/vmalloc.h>
	38	#include <linux/delay.h>
	39	#include <linux/interrupt.h>
	40	#include <asm/uaccess.h>
	41	#include <linux/fb.h>
	42	#include <linux/init.h>
	43
	44	#if defined(CONFIG_M68VZ328)
	45	#include <asm/MC68VZ328.h>
	46	#elif defined(CONFIG_M68EZ328)
	47	#include <asm/MC68EZ328.h>
	48	#elif defined(CONFIG_M68328)
	49	#include <asm/MC68328.h>
	50	#else
	51	#error wrong architecture for the MC68x328 frame buffer device
	52	#endif
	53
	54	#if defined(CONFIG_FB_68328_INVERT)
	55	#define MC68X328FB_MONO_VISUAL FB_VISUAL_MONO01
	56	#else
	57	#define MC68X328FB_MONO_VISUAL FB_VISUAL_MONO10
	58	#endif
	59
	60	static u_long videomemory;
	61	static u_long videomemorysize;
	62
	63	static struct fb_info fb_info;
	64	static u32 mc68x328fb_pseudo_palette[17];
65
66	static struct fb_var_screeninfo mc68x328fb_default __initdata = {
67	.red = { 0, 8, 0 },
68	.green = { 0, 8, 0 },
69	.blue = { 0, 8, 0 },
70	.activate = FB_ACTIVATE_TEST,
71	.height = -1,
72	.width = -1,
73	.pixclock = 20000,
74	.left_margin = 64,
75	.right_margin = 64,
76	.upper_margin = 32,
77	.lower_margin = 32,
78	.hsync_len = 64,
79	.vsync_len = 2,
80	.vmode = FB_VMODE_NONINTERLACED,
81	};
82
83	static struct fb_fix_screeninfo mc68x328fb_fix __initdata = {
84	.id = "68328fb",
85	.type = FB_TYPE_PACKED_PIXELS,
86	.xpanstep = 1,
87	.ypanstep = 1,
88	.ywrapstep = 1,
89	.accel = FB_ACCEL_NONE,
90	};
91
92	/*
93	* Interface used by the world
94	*/
95	int mc68x328fb_init(void);
96	int mc68x328fb_setup(char *);
97
98	static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
99	struct fb_info *info);
100	static int mc68x328fb_set_par(struct fb_info *info);
101	static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
102	u_int transp, struct fb_info *info);
103	static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
104	struct fb_info *info);
105	static int mc68x328fb_mmap(struct fb_info info, struct file file,
106	struct vm_area_struct *vma);
107
108	static struct fb_ops mc68x328fb_ops = {
109	.fb_check_var = mc68x328fb_check_var,
110	.fb_set_par = mc68x328fb_set_par,
111	.fb_setcolreg = mc68x328fb_setcolreg,
112	.fb_pan_display = mc68x328fb_pan_display,
113	.fb_fillrect = cfb_fillrect,
114	.fb_copyarea = cfb_copyarea,
115	.fb_imageblit = cfb_imageblit,
1da177e4 LT	116	.fb_mmap = mc68x328fb_mmap,
	117	};
	118
	119	/*
	120	* Internal routines
	121	*/
	122
	123	static u_long get_line_length(int xres_virtual, int bpp)
	124	{
	125	u_long length;
	126
	127	length = xres_virtual * bpp;
	128	length = (length + 31) & ~31;
	129	length >>= 3;
	130	return (length);
	131	}
	132
	133	/*
	134	* Setting the video mode has been split into two parts.
	135	* First part, xxxfb_check_var, must not write anything
	136	* to hardware, it should only verify and adjust var.
	137	* This means it doesn't alter par but it does use hardware
	138	* data from it to check this var.
	139	*/
	140
	141	static int mc68x328fb_check_var(struct fb_var_screeninfo *var,
	142	struct fb_info *info)
	143	{
	144	u_long line_length;
	145
	146	/*
	147	* FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
	148	* as FB_VMODE_SMOOTH_XPAN is only used internally
	149	*/
	150
	151	if (var->vmode & FB_VMODE_CONUPDATE) {
	152	var->vmode \|= FB_VMODE_YWRAP;
	153	var->xoffset = info->var.xoffset;
	154	var->yoffset = info->var.yoffset;
	155	}
	156
	157	/*
	158	* Some very basic checks
	159	*/
	160	if (!var->xres)
	161	var->xres = 1;
	162	if (!var->yres)
	163	var->yres = 1;
	164	if (var->xres > var->xres_virtual)
	165	var->xres_virtual = var->xres;
	166	if (var->yres > var->yres_virtual)
	167	var->yres_virtual = var->yres;
	168	if (var->bits_per_pixel <= 1)
	169	var->bits_per_pixel = 1;
	170	else if (var->bits_per_pixel <= 8)
	171	var->bits_per_pixel = 8;
	172	else if (var->bits_per_pixel <= 16)
	173	var->bits_per_pixel = 16;
	174	else if (var->bits_per_pixel <= 24)
	175	var->bits_per_pixel = 24;
	176	else if (var->bits_per_pixel <= 32)
	177	var->bits_per_pixel = 32;
	178	else
	179	return -EINVAL;
180
181	if (var->xres_virtual < var->xoffset + var->xres)
182	var->xres_virtual = var->xoffset + var->xres;
183	if (var->yres_virtual < var->yoffset + var->yres)
184	var->yres_virtual = var->yoffset + var->yres;
185
186	/*
187	* Memory limit
188	*/
189	line_length =
190	get_line_length(var->xres_virtual, var->bits_per_pixel);
191	if (line_length * var->yres_virtual > videomemorysize)
192	return -ENOMEM;
193
194	/*
195	* Now that we checked it we alter var. The reason being is that the video
196	* mode passed in might not work but slight changes to it might make it
197	* work. This way we let the user know what is acceptable.
198	*/
199	switch (var->bits_per_pixel) {
200	case 1:
201	var->red.offset = 0;
202	var->red.length = 1;
203	var->green.offset = 0;
204	var->green.length = 1;
205	var->blue.offset = 0;
206	var->blue.length = 1;
207	var->transp.offset = 0;
208	var->transp.length = 0;
209	break;
210	case 8:
211	var->red.offset = 0;
212	var->red.length = 8;
213	var->green.offset = 0;
214	var->green.length = 8;
215	var->blue.offset = 0;
216	var->blue.length = 8;
217	var->transp.offset = 0;
218	var->transp.length = 0;
219	break;
220	case 16: /* RGBA 5551 */
221	if (var->transp.length) {
222	var->red.offset = 0;
223	var->red.length = 5;
224	var->green.offset = 5;
225	var->green.length = 5;
226	var->blue.offset = 10;
227	var->blue.length = 5;
228	var->transp.offset = 15;
229	var->transp.length = 1;
230	} else { /* RGB 565 */
231	var->red.offset = 0;
232	var->red.length = 5;
233	var->green.offset = 5;
234	var->green.length = 6;
235	var->blue.offset = 11;
236	var->blue.length = 5;
237	var->transp.offset = 0;
238	var->transp.length = 0;
239	}
240	break;
241	case 24: /* RGB 888 */
242	var->red.offset = 0;
243	var->red.length = 8;
244	var->green.offset = 8;
245	var->green.length = 8;
246	var->blue.offset = 16;
247	var->blue.length = 8;
248	var->transp.offset = 0;
249	var->transp.length = 0;
250	break;
251	case 32: /* RGBA 8888 */
252	var->red.offset = 0;
253	var->red.length = 8;
254	var->green.offset = 8;
255	var->green.length = 8;
256	var->blue.offset = 16;
257	var->blue.length = 8;
258	var->transp.offset = 24;
259	var->transp.length = 8;
260	break;
261	}
262	var->red.msb_right = 0;
263	var->green.msb_right = 0;
264	var->blue.msb_right = 0;
265	var->transp.msb_right = 0;
266
267	return 0;
268	}
269
270	/* This routine actually sets the video mode. It's in here where we
271	* the hardware state info->par and fix which can be affected by the
272	* change in par. For this driver it doesn't do much.
273	*/
274	static int mc68x328fb_set_par(struct fb_info *info)
275	{
276	info->fix.line_length = get_line_length(info->var.xres_virtual,
277	info->var.bits_per_pixel);
278	return 0;
279	}
280
281	/*
282	* Set a single color register. The values supplied are already
283	* rounded down to the hardware's capabilities (according to the
284	* entries in the var structure). Return != 0 for invalid regno.
285	*/
286
287	static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
288	u_int transp, struct fb_info *info)
289	{
290	if (regno >= 256) /* no. of hw registers */
291	return 1;
292	/*
293	* Program hardware... do anything you want with transp
294	*/
295
296	/* grayscale works only partially under directcolor */
297	if (info->var.grayscale) {
298	/* grayscale = 0.30R + 0.59G + 0.11B /
299	red = green = blue =
300	(red * 77 + green * 151 + blue * 28) >> 8;
301	}
302
303	/* Directcolor:
304	* var->{color}.offset contains start of bitfield
305	* var->{color}.length contains length of bitfield
306	* {hardwarespecific} contains width of RAMDAC
307	* cmap[X] is programmed to (X << red.offset) \| (X << green.offset) \| (X << blue.offset)
308	* RAMDAC[X] is programmed to (red, green, blue)
309	*
310	* Pseudocolor:
311	* uses offset = 0 && length = RAMDAC register width.
312	* var->{color}.offset is 0
313	* var->{color}.length contains widht of DAC
314	* cmap is not used
315	* RAMDAC[X] is programmed to (red, green, blue)
316	* Truecolor:
317	* does not use DAC. Usually 3 are present.
318	* var->{color}.offset contains start of bitfield
319	* var->{color}.length contains length of bitfield
320	* cmap is programmed to (red << red.offset) \| (green << green.offset) \|
321	* (blue << blue.offset) \| (transp << transp.offset)
322	* RAMDAC does not exist
323	*/
324	#define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
325	switch (info->fix.visual) {
326	case FB_VISUAL_TRUECOLOR:
327	case FB_VISUAL_PSEUDOCOLOR:
328	red = CNVT_TOHW(red, info->var.red.length);
329	green = CNVT_TOHW(green, info->var.green.length);
330	blue = CNVT_TOHW(blue, info->var.blue.length);
331	transp = CNVT_TOHW(transp, info->var.transp.length);
332	break;
333	case FB_VISUAL_DIRECTCOLOR:
334	red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */
335	green = CNVT_TOHW(green, 8);
336	blue = CNVT_TOHW(blue, 8);
337	/* hey, there is bug in transp handling... */
338	transp = CNVT_TOHW(transp, 8);
339	break;
340	}
341	#undef CNVT_TOHW
342	/* Truecolor has hardware independent palette */
343	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
344	u32 v;
345
346	if (regno >= 16)
347	return 1;
348
349	v = (red << info->var.red.offset) \|
350	(green << info->var.green.offset) \|
351	(blue << info->var.blue.offset) \|
352	(transp << info->var.transp.offset);
353	switch (info->var.bits_per_pixel) {
354	case 8:
355	break;
356	case 16:
357	((u32 *) (info->pseudo_palette))[regno] = v;
358	break;
359	case 24:
360	case 32:
361	((u32 *) (info->pseudo_palette))[regno] = v;
362	break;
363	}
364	return 0;
365	}
366	return 0;
367	}
368
369	/*
370	* Pan or Wrap the Display
371	*
372	* This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
373	*/
374
375	static int mc68x328fb_pan_display(struct fb_var_screeninfo *var,
376	struct fb_info *info)
377	{
378	if (var->vmode & FB_VMODE_YWRAP) {
379	if (var->yoffset < 0
380	\|\| var->yoffset >= info->var.yres_virtual
381	\|\| var->xoffset)
382	return -EINVAL;
383	} else {
384	if (var->xoffset + var->xres > info->var.xres_virtual \|\|
385	var->yoffset + var->yres > info->var.yres_virtual)
386	return -EINVAL;
387	}
388	info->var.xoffset = var->xoffset;
389	info->var.yoffset = var->yoffset;
390	if (var->vmode & FB_VMODE_YWRAP)
391	info->var.vmode \|= FB_VMODE_YWRAP;
392	else
393	info->var.vmode &= ~FB_VMODE_YWRAP;
394	return 0;
395	}
396
397	/*
398	* Most drivers don't need their own mmap function
399	*/
400
401	static int mc68x328fb_mmap(struct fb_info info, struct file file,
402	struct vm_area_struct *vma)
403	{
404	#ifndef MMU
405	/* this is uClinux (no MMU) specific code */
406
407	vma->vm_flags \|= VM_RESERVED;
408	vma->vm_start = videomemory;
409
410	return 0;
411	#else
412	return -EINVAL;
413	#endif
414	}
415
416	int __init mc68x328fb_setup(char *options)
417	{
418	#if 0
419	char *this_opt;
420	#endif
421
422	if (!options \|\| !*options)
423	return 1;
424	#if 0
425	while ((this_opt = strsep(&options, ",")) != NULL) {
426	if (!*this_opt)
427	continue;
428	if (!strncmp(this_opt, "disable", 7))
429	mc68x328fb_enable = 0;
430	}
431	#endif
432	return 1;
433	}
434
435	/*
436	* Initialisation
437	*/
438
439	int __init mc68x328fb_init(void)
440	{
441	#ifndef MODULE
442	char *option = NULL;
443
444	if (fb_get_options("68328fb", &option))
445	return -ENODEV;
446	mc68x328fb_setup(option);
447	#endif
448	/*
449	* initialize the default mode from the LCD controller registers
450	*/
451	mc68x328fb_default.xres = LXMAX;
452	mc68x328fb_default.yres = LYMAX+1;
453	mc68x328fb_default.xres_virtual = mc68x328fb_default.xres;
454	mc68x328fb_default.yres_virtual = mc68x328fb_default.yres;
455	mc68x328fb_default.bits_per_pixel = 1 + (LPICF & 0x01);
456	videomemory = LSSA;
457	videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 *
458	mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel;
459
460	fb_info.screen_base = (void *)videomemory;
461	fb_info.fbops = &mc68x328fb_ops;
462	fb_info.var = mc68x328fb_default;
463	fb_info.fix = mc68x328fb_fix;
464	fb_info.fix.smem_start = videomemory;
465	fb_info.fix.smem_len = videomemorysize;
466	fb_info.fix.line_length =
467	get_line_length(mc68x328fb_default.xres_virtual, mc68x328fb_default.bits_per_pixel);
468	fb_info.fix.visual = (mc68x328fb_default.bits_per_pixel) == 1 ?
469	MC68X328FB_MONO_VISUAL : FB_VISUAL_PSEUDOCOLOR;
470	if (fb_info.var.bits_per_pixel == 1) {
471	fb_info.var.red.length = fb_info.var.green.length = fb_info.var.blue.length = 1;
472	fb_info.var.red.offset = fb_info.var.green.offset = fb_info.var.blue.offset = 0;
473	}
474	fb_info.pseudo_palette = &mc68x328fb_pseudo_palette;
475	fb_info.flags = FBINFO_DEFAULT \| FBINFO_HWACCEL_YPAN;
476
477	fb_alloc_cmap(&fb_info.cmap, 256, 0);
478
479	if (register_framebuffer(&fb_info) < 0) {
480	return -EINVAL;
481	}
482
483	printk(KERN_INFO
484	"fb%d: %s frame buffer device\n", fb_info.node, fb_info.fix.id);
485	printk(KERN_INFO
486	"fb%d: %dx%dx%d at 0x%08lx\n", fb_info.node,
487	mc68x328fb_default.xres_virtual, mc68x328fb_default.yres_virtual,
488	1 << mc68x328fb_default.bits_per_pixel, videomemory);
489
490	return 0;
491	}
492
493	module_init(mc68x328fb_init);
494
495	#ifdef MODULE
496
497	static void __exit mc68x328fb_cleanup(void)
498	{
499	unregister_framebuffer(&fb_info);
500	}
501
502	module_exit(mc68x328fb_cleanup);
503
504	MODULE_LICENSE("GPL");
505	#endif /* MODULE */