1 files changed, 506 insertions, 0 deletions

diff --git a/drivers/video/68328fb.c b/drivers/video/68328fb.c
new file mode 100644
index 000000000000..6a3cfbdc6dc9
--- /dev/null
+++ b/drivers/video/68328fb.c
@@ -0,0 +1,506 @@
+/*
+ *  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/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_cursor	= soft_cursor,
+	.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 */