tgafb.c

/*
 *  linux/drivers/video/tgafb.c -- DEC 21030 TGA frame buffer device
 *
 *	Copyright (C) 1995 Jay Estabrook
 *	Copyright (C) 1997 Geert Uytterhoeven
 *	Copyright (C) 1999,2000 Martin Lucina, Tom Zerucha
 *	Copyright (C) 2002 Richard Henderson
 *	Copyright (C) 2006, 2007  Maciej W. Rozycki
 *
 *  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/bitrev.h>
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/selection.h>
#include <linux/string.h>
#include <linux/tc.h>

#include <asm/io.h>

#include <video/tgafb.h>

#ifdef CONFIG_PCI
#define TGA_BUS_PCI(dev) (dev->bus == &pci_bus_type)
#else
#define TGA_BUS_PCI(dev) 0
#endif

#ifdef CONFIG_TC
#define TGA_BUS_TC(dev) (dev->bus == &tc_bus_type)
#else
#define TGA_BUS_TC(dev) 0
#endif

/*
 * Local functions.
 */

static int tgafb_check_var(struct fb_var_screeninfo *, struct fb_info *);
static int tgafb_set_par(struct fb_info *);
static void tgafb_set_pll(struct tga_par *, int);
static int tgafb_setcolreg(unsigned, unsigned, unsigned, unsigned,
			   unsigned, struct fb_info *);
static int tgafb_blank(int, struct fb_info *);
static void tgafb_init_fix(struct fb_info *);

static void tgafb_imageblit(struct fb_info *, const struct fb_image *);
static void tgafb_fillrect(struct fb_info *, const struct fb_fillrect *);
static void tgafb_copyarea(struct fb_info *, const struct fb_copyarea *);
static int tgafb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info);

static int __devinit tgafb_register(struct device *dev);
static void __devexit tgafb_unregister(struct device *dev);

static const char *mode_option;
static const char *mode_option_pci = "640x480@60";
static const char *mode_option_tc = "1280x1024@72";


static struct pci_driver tgafb_pci_driver;
static struct tc_driver tgafb_tc_driver;

/*
 *  Frame buffer operations
 */

static struct fb_ops tgafb_ops = {
	.owner			= THIS_MODULE,
	.fb_check_var		= tgafb_check_var,
	.fb_set_par		= tgafb_set_par,
	.fb_setcolreg		= tgafb_setcolreg,
	.fb_blank		= tgafb_blank,
	.fb_pan_display		= tgafb_pan_display,
	.fb_fillrect		= tgafb_fillrect,
	.fb_copyarea		= tgafb_copyarea,
	.fb_imageblit		= tgafb_imageblit,
};


#ifdef CONFIG_PCI
/*
 *  PCI registration operations
 */
static int __devinit tgafb_pci_register(struct pci_dev *,
					const struct pci_device_id *);
static void __devexit tgafb_pci_unregister(struct pci_dev *);

static struct pci_device_id const tgafb_pci_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_TGA) },
	{ }
};
MODULE_DEVICE_TABLE(pci, tgafb_pci_table);

static struct pci_driver tgafb_pci_driver = {
	.name			= "tgafb",
	.id_table		= tgafb_pci_table,
	.probe			= tgafb_pci_register,
	.remove			= __devexit_p(tgafb_pci_unregister),
};

static int __devinit
tgafb_pci_register(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	return tgafb_register(&pdev->dev);
}

static void __devexit
tgafb_pci_unregister(struct pci_dev *pdev)
{
	tgafb_unregister(&pdev->dev);
}
#endif /* CONFIG_PCI */

#ifdef CONFIG_TC
/*
 *  TC registration operations
 */
static int __devinit tgafb_tc_register(struct device *);
static int __devexit tgafb_tc_unregister(struct device *);

static struct tc_device_id const tgafb_tc_table[] = {
	{ "DEC     ", "PMAGD-AA" },
	{ "DEC     ", "PMAGD   " },
	{ }
};
MODULE_DEVICE_TABLE(tc, tgafb_tc_table);

static struct tc_driver tgafb_tc_driver = {
	.id_table		= tgafb_tc_table,
	.driver			= {
		.name		= "tgafb",
		.bus		= &tc_bus_type,
		.probe		= tgafb_tc_register,
		.remove		= __devexit_p(tgafb_tc_unregister),
	},
};

static int __devinit
tgafb_tc_register(struct device *dev)
{
	int status = tgafb_register(dev);
	if (!status)
		get_device(dev);
	return status;
}

static int __devexit
tgafb_tc_unregister(struct device *dev)
{
	put_device(dev);
	tgafb_unregister(dev);
	return 0;
}
#endif /* CONFIG_TC */


/**
 *      tgafb_check_var - Optional function.  Validates a var passed in.
 *      @var: frame buffer variable screen structure
 *      @info: frame buffer structure that represents a single frame buffer
 */
static int
tgafb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	struct tga_par *par = (struct tga_par *)info->par;

	if (par->tga_type == TGA_TYPE_8PLANE) {
		if (var->bits_per_pixel != 8)
			return -EINVAL;
	} else {
		if (var->bits_per_pixel != 32)
			return -EINVAL;
	}
	var->red.length = var->green.length = var->blue.length = 8;
	if (var->bits_per_pixel == 32) {
		var->red.offset = 16;
		var->green.offset = 8;
		var->blue.offset = 0;
	}

	if (var->xres_virtual != var->xres || var->yres_virtual != var->yres)
		return -EINVAL;
	if (var->nonstd)
		return -EINVAL;
	if (1000000000 / var->pixclock > TGA_PLL_MAX_FREQ)
		return -EINVAL;
	if ((var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
		return -EINVAL;

	/* Some of the acceleration routines assume the line width is
	   a multiple of 64 bytes.  */
	if (var->xres * (par->tga_type == TGA_TYPE_8PLANE ? 1 : 4) % 64)
		return -EINVAL;

	return 0;
}

/**
 *      tgafb_set_par - Optional function.  Alters the hardware state.
 *      @info: frame buffer structure that represents a single frame buffer
 */
static int
tgafb_set_par(struct fb_info *info)
{
	static unsigned int const deep_presets[4] = {
		0x00004000,
		0x0000440d,
		0xffffffff,
		0x0000441d
	};
	static unsigned int const rasterop_presets[4] = {
		0x00000003,
		0x00000303,
		0xffffffff,
		0x00000303
	};
	static unsigned int const mode_presets[4] = {
		0x00000000,
		0x00000300,
		0xffffffff,
		0x00000300
	};
	static unsigned int const base_addr_presets[4] = {
		0x00000000,
		0x00000001,
		0xffffffff,
		0x00000001
	};

	struct tga_par *par = (struct tga_par *) info->par;
	int tga_bus_pci = TGA_BUS_PCI(par->dev);
	int tga_bus_tc = TGA_BUS_TC(par->dev);
	u32 htimings, vtimings, pll_freq;
	u8 tga_type;
	int i;

	/* Encode video timings.  */
	htimings = (((info->var.xres/4) & TGA_HORIZ_ACT_LSB)
		    | (((info->var.xres/4) & 0x600 << 19) & TGA_HORIZ_ACT_MSB));
	vtimings = (info->var.yres & TGA_VERT_ACTIVE);
	htimings |= ((info->var.right_margin/4) << 9) & TGA_HORIZ_FP;
	vtimings |= (info->var.lower_margin << 11) & TGA_VERT_FP;
	htimings |= ((info->var.hsync_len/4) << 14) & TGA_HORIZ_SYNC;
	vtimings |= (info->var.vsync_len << 16) & TGA_VERT_SYNC;
	htimings |= ((info->var.left_margin/4) << 21) & TGA_HORIZ_BP;
	vtimings |= (info->var.upper_margin << 22) & TGA_VERT_BP;

	if (info->var.sync & FB_SYNC_HOR_HIGH_ACT)
		htimings |= TGA_HORIZ_POLARITY;
	if (info->var.sync & FB_SYNC_VERT_HIGH_ACT)
		vtimings |= TGA_VERT_POLARITY;

	par->htimings = htimings;
	par->vtimings = vtimings;

	par->sync_on_green = !!(info->var.sync & FB_SYNC_ON_GREEN);

	/* Store other useful values in par.  */
	par->xres = info->var.xres;
	par->yres = info->var.yres;
	par->pll_freq = pll_freq = 1000000000 / info->var.pixclock;
	par->bits_per_pixel = info->var.bits_per_pixel;

	tga_type = par->tga_type;

	/* First, disable video.  */
	TGA_WRITE_REG(par, TGA_VALID_VIDEO | TGA_VALID_BLANK, TGA_VALID_REG);

	/* Write the DEEP register.  */
	while (TGA_READ_REG(par, TGA_CMD_STAT_REG) & 1) /* wait for not busy */
		continue;
	mb();
	TGA_WRITE_REG(par, deep_presets[tga_type] |
			   (par->sync_on_green ? 0x0 : 0x00010000),
		      TGA_DEEP_REG);
	while (TGA_READ_REG(par, TGA_CMD_STAT_REG) & 1) /* wait for not busy */
		continue;
	mb();

	/* Write some more registers.  */
	TGA_WRITE_REG(par, rasterop_presets[tga_type], TGA_RASTEROP_REG);
	TGA_WRITE_REG(par, mode_presets[tga_type], TGA_MODE_REG);
	TGA_WRITE_REG(par, base_addr_presets[tga_type], TGA_BASE_ADDR_REG);

	/* Calculate & write the PLL.  */
	tgafb_set_pll(par, pll_freq);

	/* Write some more registers.  */
	TGA_WRITE_REG(par, 0xffffffff, TGA_PLANEMASK_REG);
	TGA_WRITE_REG(par, 0xffffffff, TGA_PIXELMASK_REG);

	/* Init video timing regs.  */
	TGA_WRITE_REG(par, htimings, TGA_HORIZ_REG);
	TGA_WRITE_REG(par, vtimings, TGA_VERT_REG);

	/* Initialise RAMDAC. */
	if (tga_type == TGA_TYPE_8PLANE && tga_bus_pci) {

		/* Init BT485 RAMDAC registers.  */
		BT485_WRITE(par, 0xa2 | (par->sync_on_green ? 0x8 : 0x0),
			    BT485_CMD_0);
		BT485_WRITE(par, 0x01, BT485_ADDR_PAL_WRITE);
		BT485_WRITE(par, 0x14, BT485_CMD_3); /* cursor 64x64 */
		BT485_WRITE(par, 0x40, BT485_CMD_1);
		BT485_WRITE(par, 0x20, BT485_CMD_2); /* cursor off, for now */
		BT485_WRITE(par, 0xff, BT485_PIXEL_MASK);

		/* Fill palette registers.  */
		BT485_WRITE(par, 0x00, BT485_ADDR_PAL_WRITE);
		TGA_WRITE_REG(par, BT485_DATA_PAL, TGA_RAMDAC_SETUP_REG);

		for (i = 0; i < 256 * 3; i += 4) {
			TGA_WRITE_REG(par, 0x55 | (BT485_DATA_PAL << 8),
				      TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, 0x00 | (BT485_DATA_PAL << 8),
				      TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, 0x00 | (BT485_DATA_PAL << 8),
				      TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, 0x00 | (BT485_DATA_PAL << 8),
				      TGA_RAMDAC_REG);
		}

	} else if (tga_type == TGA_TYPE_8PLANE && tga_bus_tc) {

		/* Init BT459 RAMDAC registers.  */
		BT459_WRITE(par, BT459_REG_ACC, BT459_CMD_REG_0, 0x40);
		BT459_WRITE(par, BT459_REG_ACC, BT459_CMD_REG_1, 0x00);
		BT459_WRITE(par, BT459_REG_ACC, BT459_CMD_REG_2,
			    (par->sync_on_green ? 0xc0 : 0x40));

		BT459_WRITE(par, BT459_REG_ACC, BT459_CUR_CMD_REG, 0x00);

		/* Fill the palette.  */
		BT459_LOAD_ADDR(par, 0x0000);
		TGA_WRITE_REG(par, BT459_PALETTE << 2, TGA_RAMDAC_SETUP_REG);

		for (i = 0; i < 256 * 3; i += 4) {
			TGA_WRITE_REG(par, 0x55, TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, 0x00, TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, 0x00, TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, 0x00, TGA_RAMDAC_REG);
		}

	} else { /* 24-plane or 24plusZ */

		/* Init BT463 RAMDAC registers.  */
		BT463_WRITE(par, BT463_REG_ACC, BT463_CMD_REG_0, 0x40);
		BT463_WRITE(par, BT463_REG_ACC, BT463_CMD_REG_1, 0x08);
		BT463_WRITE(par, BT463_REG_ACC, BT463_CMD_REG_2,
			    (par->sync_on_green ? 0xc0 : 0x40));

		BT463_WRITE(par, BT463_REG_ACC, BT463_READ_MASK_0, 0xff);
		BT463_WRITE(par, BT463_REG_ACC, BT463_READ_MASK_1, 0xff);
		BT463_WRITE(par, BT463_REG_ACC, BT463_READ_MASK_2, 0xff);
		BT463_WRITE(par, BT463_REG_ACC, BT463_READ_MASK_3, 0x0f);

		BT463_WRITE(par, BT463_REG_ACC, BT463_BLINK_MASK_0, 0x00);
		BT463_WRITE(par, BT463_REG_ACC, BT463_BLINK_MASK_1, 0x00);
		BT463_WRITE(par, BT463_REG_ACC, BT463_BLINK_MASK_2, 0x00);
		BT463_WRITE(par, BT463_REG_ACC, BT463_BLINK_MASK_3, 0x00);

		/* Fill the palette.  */
		BT463_LOAD_ADDR(par, 0x0000);
		TGA_WRITE_REG(par, BT463_PALETTE << 2, TGA_RAMDAC_SETUP_REG);

#ifdef CONFIG_HW_CONSOLE
		for (i = 0; i < 16; i++) {
			int j = color_table[i];

			TGA_WRITE_REG(par, default_red[j], TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, default_grn[j], TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, default_blu[j], TGA_RAMDAC_REG);
		}
		for (i = 0; i < 512 * 3; i += 4) {
#else
		for (i = 0; i < 528 * 3; i += 4) {
#endif
			TGA_WRITE_REG(par, 0x55, TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, 0x00, TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, 0x00, TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, 0x00, TGA_RAMDAC_REG);
		}

		/* Fill window type table after start of vertical retrace.  */
		while (!(TGA_READ_REG(par, TGA_INTR_STAT_REG) & 0x01))
			continue;
		TGA_WRITE_REG(par, 0x01, TGA_INTR_STAT_REG);
		mb();
		while (!(TGA_READ_REG(par, TGA_INTR_STAT_REG) & 0x01))
			continue;
		TGA_WRITE_REG(par, 0x01, TGA_INTR_STAT_REG);

		BT463_LOAD_ADDR(par, BT463_WINDOW_TYPE_BASE);
		TGA_WRITE_REG(par, BT463_REG_ACC << 2, TGA_RAMDAC_SETUP_REG);

		for (i = 0; i < 16; i++) {
			TGA_WRITE_REG(par, 0x00, TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, 0x01, TGA_RAMDAC_REG);
			TGA_WRITE_REG(par, 0x00, TGA_RAMDAC_REG);
		}

	}

	/* Finally, enable video scan (and pray for the monitor... :-) */
	TGA_WRITE_REG(par, TGA_VALID_VIDEO, TGA_VALID_REG);

	return 0;
}

#define DIFFCHECK(X)							  \
do {									  \
	if (m <= 0x3f) {						  \
		int delta = f - (TGA_PLL_BASE_FREQ * (X)) / (r << shift); \
		if (delta < 0)						  \
			delta = -delta;					  \
		if (delta < min_diff)					  \
			min_diff = delta, vm = m, va = a, vr = r;	  \
	}								  \
} while (0)

static void
tgafb_set_pll(struct tga_par *par, int f)
{
	int n, shift, base, min_diff, target;
	int r,a,m,vm = 34, va = 1, vr = 30;

	for (r = 0 ; r < 12 ; r++)
		TGA_WRITE_REG(par, !r, TGA_CLOCK_REG);

	if (f > TGA_PLL_MAX_FREQ)
		f = TGA_PLL_MAX_FREQ;

	if (f >= TGA_PLL_MAX_FREQ / 2)
		shift = 0;
	else if (f >= TGA_PLL_MAX_FREQ / 4)
		shift = 1;
	else
		shift = 2;

	TGA_WRITE_REG(par, shift & 1, TGA_CLOCK_REG);
	TGA_WRITE_REG(par, shift >> 1, TGA_CLOCK_REG);

	for (r = 0 ; r < 10 ; r++)
		TGA_WRITE_REG(par, 0, TGA_CLOCK_REG);

	if (f <= 120000) {
		TGA_WRITE_REG(par, 0, TGA_CLOCK_REG);
		TGA_WRITE_REG(par, 0, TGA_CLOCK_REG);
	}
	else if (f <= 200000) {
		TGA_WRITE_REG(par, 1, TGA_CLOCK_REG);
		TGA_WRITE_REG(par, 0, TGA_CLOCK_REG);
	}
	else {
		TGA_WRITE_REG(par, 0, TGA_CLOCK_REG);
		TGA_WRITE_REG(par, 1, TGA_CLOCK_REG);
	}

	TGA_WRITE_REG(par, 1, TGA_CLOCK_REG);
	TGA_WRITE_REG(par, 0, TGA_CLOCK_REG);
	TGA_WRITE_REG(par, 0, TGA_CLOCK_REG);
	TGA_WRITE_REG(par, 1, TGA_CLOCK_REG);
	TGA_WRITE_REG(par, 0, TGA_CLOCK_REG);
	TGA_WRITE_REG(par, 1, TGA_CLOCK_REG);

	target = (f << shift) / TGA_PLL_BASE_FREQ;
	min_diff = TGA_PLL_MAX_FREQ;

	r = 7 / target;
	if (!r) r = 1;

	base = target * r;
	while (base < 449) {
		for (n = base < 7 ? 7 : base; n < base + target && n < 449; n++) {
			m = ((n + 3) / 7) - 1;
			a = 0;
			DIFFCHECK((m + 1) * 7);
			m++;
			DIFFCHECK((m + 1) * 7);
			m = (n / 6) - 1;
			if ((a = n % 6))
				DIFFCHECK(n);
		}
		r++;
		base += target;
	}

	vr--;

	for (r = 0; r < 8; r++)
		TGA_WRITE_REG(par, (vm >> r) & 1, TGA_CLOCK_REG);
	for (r = 0; r < 8 ; r++)
		TGA_WRITE_REG(par, (va >> r) & 1, TGA_CLOCK_REG);
	for (r = 0; r < 7 ; r++)
		TGA_WRITE_REG(par, (vr >> r) & 1, TGA_CLOCK_REG);
	TGA_WRITE_REG(par, ((vr >> 7) & 1)|2, TGA_CLOCK_REG);
}


/**
 *      tgafb_setcolreg - Optional function. Sets a color register.
 *      @regno: boolean, 0 copy local, 1 get_user() function
 *      @red: frame buffer colormap structure
 *      @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
 */
static int
tgafb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue,
		unsigned transp, struct fb_info *info)
{
	struct tga_par *par = (struct tga_par *) info->par;
	int tga_bus_pci = TGA_BUS_PCI(par->dev);
	int tga_bus_tc = TGA_BUS_TC(par->dev);

	if (regno > 255)
		return 1;
	red >>= 8;
	green >>= 8;
	blue >>= 8;

	if (par->tga_type == TGA_TYPE_8PLANE && tga_bus_pci) {
		BT485_WRITE(par, regno, BT485_ADDR_PAL_WRITE);
		TGA_WRITE_REG(par, BT485_DATA_PAL, TGA_RAMDAC_SETUP_REG);
		TGA_WRITE_REG(par, red|(BT485_DATA_PAL<<8),TGA_RAMDAC_REG);
		TGA_WRITE_REG(par, green|(BT485_DATA_PAL<<8),TGA_RAMDAC_REG);
		TGA_WRITE_REG(par, blue|(BT485_DATA_PAL<<8),TGA_RAMDAC_REG);
	} else if (par->tga_type == TGA_TYPE_8PLANE && tga_bus_tc) {
		BT459_LOAD_ADDR(par, regno);
		TGA_WRITE_REG(par, BT459_PALETTE << 2, TGA_RAMDAC_SETUP_REG);
		TGA_WRITE_REG(par, red, TGA_RAMDAC_REG);
		TGA_WRITE_REG(par, green, TGA_RAMDAC_REG);
		TGA_WRITE_REG(par, blue, TGA_RAMDAC_REG);
	} else {
		if (regno < 16) {
			u32 value = (regno << 16) | (regno << 8) | regno;
			((u32 *)info->pseudo_palette)[regno] = value;
		}
		BT463_LOAD_ADDR(par, regno);
		TGA_WRITE_REG(par, BT463_PALETTE << 2, TGA_RAMDAC_SETUP_REG);
		TGA_WRITE_REG(par, red, TGA_RAMDAC_REG);
		TGA_WRITE_REG(par, green, TGA_RAMDAC_REG);
		TGA_WRITE_REG(par, blue, TGA_RAMDAC_REG);
	}

	return 0;
}


/**
 *      tgafb_blank - Optional function.  Blanks the display.
 *      @blank_mode: the blank mode we want.
 *      @info: frame buffer structure that represents a single frame buffer
 */
static int
tgafb_blank(int blank, struct fb_info *info)
{
	struct tga_par *par = (struct tga_par *) info->par;
	u32 vhcr, vvcr, vvvr;
	unsigned long flags;

	local_irq_save(flags);

	vhcr = TGA_READ_REG(par, TGA_HORIZ_REG);
	vvcr = TGA_READ_REG(par, TGA_VERT_REG);
	vvvr = TGA_READ_REG(par, TGA_VALID_REG);
	vvvr &= ~(TGA_VALID_VIDEO | TGA_VALID_BLANK);

	switch (blank) {
	case FB_BLANK_UNBLANK: /* Unblanking */
		if (par->vesa_blanked) {
			TGA_WRITE_REG(par, vhcr & 0xbfffffff, TGA_HORIZ_REG);
			TGA_WRITE_REG(par, vvcr & 0xbfffffff, TGA_VERT_REG);
			par->vesa_blanked = 0;
		}
		TGA_WRITE_REG(par, vvvr | TGA_VALID_VIDEO, TGA_VALID_REG);
		break;

	case FB_BLANK_NORMAL: /* Normal blanking */
		TGA_WRITE_REG(par, vvvr | TGA_VALID_VIDEO | TGA_VALID_BLANK,
			      TGA_VALID_REG);
		break;

	case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
		TGA_WRITE_REG(par, vvcr | 0x40000000, TGA_VERT_REG);
		TGA_WRITE_REG(par, vvvr | TGA_VALID_BLANK, TGA_VALID_REG);
		par->vesa_blanked = 1;
		break;

	case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
		TGA_WRITE_REG(par, vhcr | 0x40000000, TGA_HORIZ_REG);
		TGA_WRITE_REG(par, vvvr | TGA_VALID_BLANK, TGA_VALID_REG);
		par->vesa_blanked = 1;
		break;

	case FB_BLANK_POWERDOWN: /* Poweroff */
		TGA_WRITE_REG(par, vhcr | 0x40000000, TGA_HORIZ_REG);
		TGA_WRITE_REG(par, vvcr | 0x40000000, TGA_VERT_REG);
		TGA_WRITE_REG(par, vvvr | TGA_VALID_BLANK, TGA_VALID_REG);
		par->vesa_blanked = 1;
		break;
	}

	local_irq_restore(flags);
	return 0;
}


/*
 *  Acceleration.
 */

static void
tgafb_mono_imageblit(struct fb_info *info, const struct fb_image *image)
{
	struct tga_par *par = (struct tga_par *) info->par;
	u32 fgcolor, bgcolor, dx, dy, width, height, vxres, vyres, pixelmask;
	unsigned long rincr, line_length, shift, pos, is8bpp;
	unsigned long i, j;
	const unsigned char *data;
	void __iomem *regs_base;
	void __iomem *fb_base;

	is8bpp = info->var.bits_per_pixel == 8;

	dx = image->dx;
	dy = image->dy;
	width = image->width;
	height = image->height;
	vxres = info->var.xres_virtual;
	vyres = info->var.yres_virtual;
	line_length = info->fix.line_length;
	rincr = (width + 7) / 8;

	/* A shift below cannot cope with.  */
	if (unlikely(width == 0))
		return;
	/* Crop the image to the screen.  */
	if (dx > vxres || dy > vyres)
		return;
	if (dx + width > vxres)
		width = vxres - dx;
	if (dy + height > vyres)
		height = vyres - dy;

	regs_base = par->tga_regs_base;
	fb_base = par->tga_fb_base;

	/* Expand the color values to fill 32-bits.  */
	/* ??? Would be nice to notice colour changes elsewhere, so
	   that we can do this only when necessary.  */
	fgcolor = image->fg_color;
	bgcolor = image->bg_color;
	if (is8bpp) {
		fgcolor |= fgcolor << 8;
		fgcolor |= fgcolor << 16;
		bgcolor |= bgcolor << 8;
		bgcolor |= bgcolor << 16;
	} else {
		if (fgcolor < 16)
			fgcolor = ((u32 *)info->pseudo_palette)[fgcolor];
		if (bgcolor < 16)
			bgcolor = ((u32 *)info->pseudo_palette)[bgcolor];
	}
	__raw_writel(fgcolor, regs_base + TGA_FOREGROUND_REG);
	__raw_writel(bgcolor, regs_base + TGA_BACKGROUND_REG);

	/* Acquire proper alignment; set up the PIXELMASK register
	   so that we only write the proper character cell.  */
	pos = dy * line_length;
	if (is8bpp) {
		pos += dx;
		shift = pos & 3;
		pos &= -4;
	} else {
		pos += dx * 4;
		shift = (pos & 7) >> 2;
		pos &= -8;
	}

	data = (const unsigned char *) image->data;

	/* Enable opaque stipple mode.  */
	__raw_writel((is8bpp
		      ? TGA_MODE_SBM_8BPP | TGA_MODE_OPAQUE_STIPPLE
		      : TGA_MODE_SBM_24BPP | TGA_MODE_OPAQUE_STIPPLE),
		     regs_base + TGA_MODE_REG);

	if (width + shift <= 32) {
		unsigned long bwidth;

		/* Handle common case of imaging a single character, in
		   a font less than or 32 pixels wide.  */

		/* Avoid a shift by 32; width > 0 implied.  */
		pixelmask = (2ul << (width - 1)) - 1;
		pixelmask <<= shift;
		__raw_writel(pixelmask, regs_base + TGA_PIXELMASK_REG);
		wmb();

		bwidth = (width + 7) / 8;

		for (i = 0; i < height; ++i) {
			u32 mask = 0;

			/* The image data is bit big endian; we need
			   little endian.  */
			for (j = 0; j < bwidth; ++j)
				mask |= bitrev8(data[j]) << (j * 8);

			__raw_writel(mask << shift, fb_base + pos);

			pos += line_length;
			data += rincr;
		}
		wmb();
		__raw_writel(0xffffffff, regs_base + TGA_PIXELMASK_REG);
	} else if (shift == 0) {
		unsigned long pos0 = pos;
		const unsigned char *data0 = data;
		unsigned long bincr = (is8bpp ? 8 : 8*4);
		unsigned long bwidth;

		/* Handle another common case in which accel_putcs
		   generates a large bitmap, which happens to be aligned.
		   Allow the tail to be misaligned.  This case is 
		   interesting because we've not got to hold partial
		   bytes across the words being written.  */

		wmb();

		bwidth = (width / 8) & -4;
		for (i = 0; i < height; ++i) {
			for (j = 0; j < bwidth; j += 4) {
				u32 mask = 0;
				mask |= bitrev8(data[j+0]) << (0 * 8);
				mask |= bitrev8(data[j+1]) << (1 * 8);
				mask |= bitrev8(data[j+2]) << (2 * 8);
				mask |= bitrev8(data[j+3]) << (3 * 8);
				__raw_writel(mask, fb_base + pos + j*bincr);
			}
			pos += line_length;
			data += rincr;
		}
		wmb();

		pixelmask = (1ul << (width & 31)) - 1;
		if (pixelmask) {
			__raw_writel(pixelmask, regs_base + TGA_PIXELMASK_REG);
			wmb();

			pos = pos0 + bwidth*bincr;
			data = data0 + bwidth;
			bwidth = ((width & 31) + 7) / 8;

			for (i = 0; i < height; ++i) {
				u32 mask = 0;
				for (j = 0; j < bwidth; ++j)
					mask |= bitrev8(data[j]) << (j * 8);
				__raw_writel(mask, fb_base + pos);
				pos += line_length;
				data += rincr;
			}
			wmb();
			__raw_writel(0xffffffff, regs_base + TGA_PIXELMASK_REG);
		}
	} else {
		unsigned long pos0 = pos;
		const unsigned char *data0 = data;
		unsigned long bincr = (is8bpp ? 8 : 8*4);
		unsigned long bwidth;

		/* Finally, handle the generic case of misaligned start.
		   Here we split the write into 16-bit spans.  This allows
		   us to use only one pixel mask, instead of four as would
		   be required by writing 24-bit spans.  */

		pixelmask = 0xffff << shift;
		__raw_writel(pixelmask, regs_base + TGA_PIXELMASK_REG);
		wmb();

		bwidth = (width / 8) & -2;
		for (i = 0; i < height; ++i) {
			for (j = 0; j < bwidth; j += 2) {
				u32 mask = 0;
				mask |= bitrev8(data[j+0]) << (0 * 8);
				mask |= bitrev8(data[j+1]) << (1 * 8);
				mask <<= shift;
				__raw_writel(mask, fb_base + pos + j*bincr);
			}
			pos += line_length;
			data += rincr;
		}
		wmb();

		pixelmask = ((1ul << (width & 15)) - 1) << shift;
		if (pixelmask) {
			__raw_writel(pixelmask, regs_base + TGA_PIXELMASK_REG);
			wmb();

			pos = pos0 + bwidth*bincr;
			data = data0 + bwidth;
			bwidth = (width & 15) > 8;

			for (i = 0; i < height; ++i) {
				u32 mask = bitrev8(data[0]);
				if (bwidth)
					mask |= bitrev8(data[1]) << 8;
				mask <<= shift;
				__raw_writel(mask, fb_base + pos);
				pos += line_length;
				data += rincr;
			}
			wmb();
		}
		__raw_writel(0xffffffff, regs_base + TGA_PIXELMASK_REG);
	}

	/* Disable opaque stipple mode.  */
	__raw_writel((is8bpp
		      ? TGA_MODE_SBM_8BPP | TGA_MODE_SIMPLE
		      : TGA_MODE_SBM_24BPP | TGA_MODE_SIMPLE),
		     regs_base + TGA_MODE_REG);
}

static void
tgafb_clut_imageblit(struct fb_info *info, const struct fb_image *image)
{
	struct tga_par *par = (struct tga_par *) info->par;
	u32 color, dx, dy, width, height, vxres, vyres;
	u32 *palette = ((u32 *)info->pseudo_palette);
	unsigned long pos, line_length, i, j;
	const unsigned char *data;
	void __iomem *regs_base, *fb_base;

	dx = image->dx;
	dy = image->dy;
	width = image->width;
	height = image->height;
	vxres = info->var.xres_virtual;
	vyres = info->var.yres_virtual;
	line_length = info->fix.line_length;

	/* Crop the image to the screen.  */
	if (dx > vxres || dy > vyres)
		return;
	if (dx + width > vxres)
		width = vxres - dx;
	if (dy + height > vyres)
		height = vyres - dy;

	regs_base = par->tga_regs_base;
	fb_base = par->tga_fb_base;

	pos = dy * line_length + (dx * 4);
	data = image->data;

	/* Now copy the image, color_expanding via the palette. */
	for (i = 0; i < height; i++) {
		for (j = 0; j < width; j++) {
			color = palette[*data++];
			__raw_writel(color, fb_base + pos + j*4);
		}
		pos += line_length;
	}
}

/**
 *      tgafb_imageblit - REQUIRED function. Can use generic routines if
 *                        non acclerated hardware and packed pixel based.
 *                        Copies a image from system memory to the screen.
 *
 *      @info: frame buffer structure that represents a single frame buffer
 *      @image: structure defining the image.
 */
static void
tgafb_imageblit(struct fb_info *info, const struct fb_image *image)
{
	unsigned int is8bpp = info->var.bits_per_pixel == 8;

	/* If a mono image, regardless of FB depth, go do it. */
	if (image->depth == 1) {
		tgafb_mono_imageblit(info, image);
		return;
	}

	/* For copies that aren't pixel expansion, there's little we
	   can do better than the generic code.  */
	/* ??? There is a DMA write mode; I wonder if that could be
	   made to pull the data from the image buffer...  */
	if (image->depth == info->var.bits_per_pixel) {
		cfb_imageblit(info, image);
		return;
	}

	/* If 24-plane FB and the image is 8-plane with CLUT, we can do it. */
	if (!is8bpp && image->depth == 8) {
		tgafb_clut_imageblit(info, image);
		return;
	}

	/* Silently return... */
}

/**
 *      tgafb_fillrect - REQUIRED function. Can use generic routines if 
 *                       non acclerated hardware and packed pixel based.
 *                       Draws a rectangle on the screen.               
 *
 *      @info: frame buffer structure that represents a single frame buffer
 *      @rect: structure defining the rectagle and operation.
 */
static void
tgafb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
	struct tga_par *par = (struct tga_par *) info->par;
	int is8bpp = info->var.bits_per_pixel == 8;
	u32 dx, dy, width, height, vxres, vyres, color;
	unsigned long pos, align, line_length, i, j;
	void __iomem *regs_base;
	void __iomem *fb_base;

	dx = rect->dx;
	dy = rect->dy;
	width = rect->width;
	height = rect->height;
	vxres = info->var.xres_virtual;
	vyres = info->var.yres_virtual;
	line_length = info->fix.line_length;
	regs_base = par->tga_regs_base;
	fb_base = par->tga_fb_base;

	/* Crop the rectangle to the screen.  */
	if (dx > vxres || dy > vyres || !width || !height)
		return;
	if (dx + width > vxres)
		width = vxres - dx;
	if (dy + height > vyres)
		height = vyres - dy;

	pos = dy * line_length + dx * (is8bpp ? 1 : 4);

	/* ??? We could implement ROP_XOR with opaque fill mode
	   and a RasterOp setting of GXxor, but as far as I can
	   tell, this mode is not actually used in the kernel.
	   Thus I am ignoring it for now.  */
	if (rect->rop != ROP_COPY) {
		cfb_fillrect(info, rect);
		return;
	}

	/* Expand the color value to fill 8 pixels.  */
	color = rect->color;
	if (is8bpp) {
		color |= color << 8;
		color |= color << 16;
		__raw_writel(color, regs_base + TGA_BLOCK_COLOR0_REG);
		__raw_writel(color, regs_base + TGA_BLOCK_COLOR1_REG);
	} else {
		if (color < 16)
			color = ((u32 *)info->pseudo_palette)[color];
		__raw_writel(color, regs_base + TGA_BLOCK_COLOR0_REG);
		__raw_writel(color, regs_base + TGA_BLOCK_COLOR1_REG);
		__raw_writel(color, regs_base + TGA_BLOCK_COLOR2_REG);
		__raw_writel(color, regs_base + TGA_BLOCK_COLOR3_REG);
		__raw_writel(color, regs_base + TGA_BLOCK_COLOR4_REG);
		__raw_writel(color, regs_base + TGA_BLOCK_COLOR5_REG);
		__raw_writel(color, regs_base + TGA_BLOCK_COLOR6_REG);
		__raw_writel(color, regs_base + TGA_BLOCK_COLOR7_REG);
	}

	/* The DATA register holds the fill mask for block fill mode.
	   Since we're not stippling, this is all ones.  */
	__raw_writel(0xffffffff, regs_base + TGA_DATA_REG);

	/* Enable block fill mode.  */
	__raw_writel((is8bpp
		      ? TGA_MODE_SBM_8BPP | TGA_MODE_BLOCK_FILL
		      : TGA_MODE_SBM_24BPP | TGA_MODE_BLOCK_FILL),
		     regs_base + TGA_MODE_REG);
	wmb();

	/* We can fill 2k pixels per operation.  Notice blocks that fit
	   the width of the screen so that we can take advantage of this
	   and fill more than one line per write.  */
	if (width == line_length)
		width *= height, height = 1;

	/* The write into the frame buffer must be aligned to 4 bytes,
	   but we are allowed to encode the offset within the word in
	   the data word written.  */
	align = (pos & 3) << 16;
	pos &= -4;

	if (width <= 2048) {
		u32 data;

		data = (width - 1) | align;

		for (i = 0; i < height; ++i) {
			__raw_writel(data, fb_base + pos);
			pos += line_length;
		}
	} else {
		unsigned long Bpp = (is8bpp ? 1 : 4);
		unsigned long nwidth = width & -2048;
		u32 fdata, ldata;

		fdata = (2048 - 1) | align;
		ldata = ((width & 2047) - 1) | align;

		for (i = 0; i < height; ++i) {
			for (j = 0; j < nwidth; j += 2048)
				__raw_writel(fdata, fb_base + pos + j*Bpp);
			if (j < width)
				__raw_writel(ldata, fb_base + pos + j*Bpp);
			pos += line_length;
		}
	}
	wmb();

	/* Disable block fill mode.  */
	__raw_writel((is8bpp
		      ? TGA_MODE_SBM_8BPP | TGA_MODE_SIMPLE
		      : TGA_MODE_SBM_24BPP | TGA_MODE_SIMPLE),
		     regs_base + TGA_MODE_REG);
}

/**
 *      tgafb_copyarea - REQUIRED function. Can use generic routines if
 *                       non acclerated hardware and packed pixel based.
 *                       Copies on area of the screen to another area.
 *
 *      @info: frame buffer structure that represents a single frame buffer
 *      @area: structure defining the source and destination.
 */

/* Handle the special case of copying entire lines, e.g. during scrolling.
   We can avoid a lot of needless computation in this case.  In the 8bpp
   case we need to use the COPY64 registers instead of mask writes into 
   the frame buffer to achieve maximum performance.  */

static inline void
copyarea_line_8bpp(struct fb_info *info, u32 dy, u32 sy,
		   u32 height, u32 width)
{
	struct tga_par *par = (struct tga_par *) info->par;
	void __iomem *tga_regs = par->tga_regs_base;
	unsigned long dpos, spos, i, n64;

	/* Set up the MODE and PIXELSHIFT registers.  */
	__raw_writel(TGA_MODE_SBM_8BPP | TGA_MODE_COPY, tga_regs+TGA_MODE_REG);
	__raw_writel(0, tga_regs+TGA_PIXELSHIFT_REG);
	wmb();

	n64 = (height * width) / 64;

	if (sy < dy) {
		spos = (sy + height) * width;
		dpos = (dy + height) * width;

		for (i = 0; i < n64; ++i) {
			spos -= 64;
			dpos -= 64;
			__raw_writel(spos, tga_regs+TGA_COPY64_SRC);
			wmb();
			__raw_writel(dpos, tga_regs+TGA_COPY64_DST);
			wmb();
		}
	} else {
		spos = sy * width;
		dpos = dy * width;

		for (i = 0; i < n64; ++i) {
			__raw_writel(spos, tga_regs+TGA_COPY64_SRC);
			wmb();
			__raw_writel(dpos, tga_regs+TGA_COPY64_DST);
			wmb();
			spos += 64;
			dpos += 64;
		}
	}

	/* Reset the MODE register to normal.  */
	__raw_writel(TGA_MODE_SBM_8BPP|TGA_MODE_SIMPLE, tga_regs+TGA_MODE_REG);
}

static inline void
copyarea_line_32bpp(struct fb_info *info, u32 dy, u32 sy,
		    u32 height, u32 width)
{
	struct tga_par *par = (struct tga_par *) info->par;
	void __iomem *tga_regs = par->tga_regs_base;
	void __iomem *tga_fb = par->tga_fb_base;
	void __iomem *src;
	void __iomem *dst;
	unsigned long i, n16;

	/* Set up the MODE and PIXELSHIFT registers.  */
	__raw_writel(TGA_MODE_SBM_24BPP | TGA_MODE_COPY, tga_regs+TGA_MODE_REG);
	__raw_writel(0, tga_regs+TGA_PIXELSHIFT_REG);
	wmb();

	n16 = (height * width) / 16;

	if (sy < dy) {
		src = tga_fb + (sy + height) * width * 4;
		dst = tga_fb + (dy + height) * width * 4;

		for (i = 0; i < n16; ++i) {
			src -= 64;
			dst -= 64;
			__raw_writel(0xffff, src);
			wmb();
			__raw_writel(0xffff, dst);
			wmb();
		}
	} else {
		src = tga_fb + sy * width * 4;
		dst = tga_fb + dy * width * 4;

		for (i = 0; i < n16; ++i) {
			__raw_writel(0xffff, src);
			wmb();
			__raw_writel(0xffff, dst);
			wmb();
			src += 64;
			dst += 64;
		}
	}

	/* Reset the MODE register to normal.  */
	__raw_writel(TGA_MODE_SBM_24BPP|TGA_MODE_SIMPLE, tga_regs+TGA_MODE_REG);
}

/* The general case of forward copy in 8bpp mode.  */
static inline void
copyarea_foreward_8bpp(struct fb_info *info, u32 dx, u32 dy, u32 sx, u32 sy,
		       u32 height, u32 width, u32 line_length)
{
	struct tga_par *par = (struct tga_par *) info->par;
	unsigned long i, copied, left;
	unsigned long dpos, spos, dalign, salign, yincr;
	u32 smask_first, dmask_first, dmask_last;
	int pixel_shift, need_prime, need_second;
	unsigned long n64, n32, xincr_first;
	void __iomem *tga_regs;
	void __iomem *tga_fb;

	yincr = line_length;
	if (dy > sy) {
		dy += height - 1;
		sy += height - 1;
		yincr = -yincr;
	}

	/* Compute the offsets and alignments in the frame buffer.
	   More than anything else, these control how we do copies.  */
	dpos = dy * line_length + dx;
	spos = sy * line_length + sx;
	dalign = dpos & 7;
	salign = spos & 7;
	dpos &= -8;
	spos &= -8;

	/* Compute the value for the PIXELSHIFT register.  This controls
	   both non-co-aligned source and destination and copy direction.  */
	if (dalign >= salign)
		pixel_shift = dalign - salign;
	else
		pixel_shift = 8 - (salign - dalign);

	/* Figure out if we need an additional priming step for the
	   residue register.  */
	need_prime = (salign > dalign);
	if (need_prime)
		dpos -= 8;

	/* Begin by copying the leading unaligned destination.  Copy enough
	   to make the next destination address 32-byte aligned.  */
	copied = 32 - (dalign + (dpos & 31));
	if (copied == 32)
		copied = 0;
	xincr_first = (copied + 7) & -8;
	smask_first = dmask_first = (1ul << copied) - 1;
	smask_first <<= salign;
	dmask_first <<= dalign + need_prime*8;
	if (need_prime && copied > 24)
		copied -= 8;
	left = width - copied;

	/* Care for small copies.  */
	if (copied > width) {
		u32 t;
		t = (1ul << width) - 1;
		t <<= dalign + need_prime*8;
		dmask_first &= t;
		left = 0;
	}

	/* Attempt to use 64-byte copies.  This is only possible if the
	   source and destination are co-aligned at 64 bytes.  */
	n64 = need_second = 0;
	if ((dpos & 63) == (spos & 63)
	    && (height == 1 || line_length % 64 == 0)) {
		/* We may need a 32-byte copy to ensure 64 byte alignment.  */
		need_second = (dpos + xincr_first) & 63;
		if ((need_second & 32) != need_second)
			printk(KERN_ERR "tgafb: need_second wrong\n");
		if (left >= need_second + 64) {
			left -= need_second;
			n64 = left / 64;
			left %= 64;
		} else
			need_second = 0;
	}

	/* Copy trailing full 32-byte sections.  This will be the main
	   loop if the 64 byte loop can't be used.  */
	n32 = left / 32;
	left %= 32;

	/* Copy the trailing unaligned destination.  */
	dmask_last = (1ul << left) - 1;

	tga_regs = par->tga_regs_base;
	tga_fb = par->tga_fb_base;

	/* Set up the MODE and PIXELSHIFT registers.  */
	__raw_writel(TGA_MODE_SBM_8BPP|TGA_MODE_COPY, tga_regs+TGA_MODE_REG);
	__raw_writel(pixel_shift, tga_regs+TGA_PIXELSHIFT_REG);
	wmb();

	for (i = 0; i < height; ++i) {
		unsigned long j;
		void __iomem *sfb;
		void __iomem *dfb;

		sfb = tga_fb + spos;
		dfb = tga_fb + dpos;
		if (dmask_first) {
			__raw_writel(smask_first, sfb);
			wmb();
			__raw_writel(dmask_first, dfb);
			wmb();
			sfb += xincr_first;
			dfb += xincr_first;
		}

		if (need_second) {
			__raw_writel(0xffffffff, sfb);
			wmb();
			__raw_writel(0xffffffff, dfb);
			wmb();
			sfb += 32;
			dfb += 32;
		}

		if (n64 && (((unsigned long)sfb | (unsigned long)dfb) & 63))
			printk(KERN_ERR
			       "tgafb: misaligned copy64 (s:%p, d:%p)\n",
			       sfb, dfb);

		for (j = 0; j < n64; ++j) {
			__raw_writel(sfb - tga_fb, tga_regs+TGA_COPY64_SRC);
			wmb();
			__raw_writel(dfb - tga_fb, tga_regs+TGA_COPY64_DST);
			wmb();
			sfb += 64;
			dfb += 64;
		}

		for (j = 0; j < n32; ++j) {
			__raw_writel(0xffffffff, sfb);
			wmb();
			__raw_writel(0xffffffff, dfb);
			wmb();
			sfb += 32;
			dfb += 32;
		}

		if (dmask_last) {
			__raw_writel(0xffffffff, sfb);
			wmb();
			__raw_writel(dmask_last, dfb);
			wmb();
		}

		spos += yincr;
		dpos += yincr;
	}

	/* Reset the MODE register to normal.  */
	__raw_writel(TGA_MODE_SBM_8BPP|TGA_MODE_SIMPLE, tga_regs+TGA_MODE_REG);
}

/* The (almost) general case of backward copy in 8bpp mode.  */
static inline void
copyarea_backward_8bpp(struct fb_info *info, u32 dx, u32 dy, u32 sx, u32 sy,
		       u32 height, u32 width, u32 line_length,
		       const struct fb_copyarea *area)
{
	struct tga_par *par = (struct tga_par *) info->par;
	unsigned long i, left, yincr;
	unsigned long depos, sepos, dealign, sealign;
	u32 mask_first, mask_last;
	unsigned long n32;
	void __iomem *tga_regs;
	void __iomem *tga_fb;

	yincr = line_length;
	if (dy > sy) {
		dy += height - 1;
		sy += height - 1;
		yincr = -yincr;
	}

	/* Compute the offsets and alignments in the frame buffer.
	   More than anything else, these control how we do copies.  */
	depos = dy * line_length + dx + width;
	sepos = sy * line_length + sx + width;
	dealign = depos & 7;
	sealign = sepos & 7;

	/* ??? The documentation appears to be incorrect (or very
	   misleading) wrt how pixel shifting works in backward copy
	   mode, i.e. when PIXELSHIFT is negative.  I give up for now.
	   Do handle the common case of co-aligned backward copies,
	   but frob everything else back on generic code.  */
	if (dealign != sealign) {
		cfb_copyarea(info, area);
		return;
	}

	/* We begin the copy with the trailing pixels of the
	   unaligned destination.  */
	mask_first = (1ul << dealign) - 1;
	left = width - dealign;

	/* Care for small copies.  */
	if (dealign > width) {
		mask_first ^= (1ul << (dealign - width)) - 1;
		left = 0;
	}

	/* Next copy full words at a time.  */
	n32 = left / 32;
	left %= 32;

	/* Finally copy the unaligned head of the span.  */
	mask_last = -1 << (32 - left);

	tga_regs = par->tga_regs_base;
	tga_fb = par->tga_fb_base;

	/* Set up the MODE and PIXELSHIFT registers.  */
	__raw_writel(TGA_MODE_SBM_8BPP|TGA_MODE_COPY, tga_regs+TGA_MODE_REG);
	__raw_writel(0, tga_regs+TGA_PIXELSHIFT_REG);
	wmb();

	for (i = 0; i < height; ++i) {
		unsigned long j;
		void __iomem *sfb;
		void __iomem *dfb;

		sfb = tga_fb + sepos;
		dfb = tga_fb + depos;
		if (mask_first) {
			__raw_writel(mask_first, sfb);
			wmb();
			__raw_writel(mask_first, dfb);
			wmb();
		}

		for (j = 0; j < n32; ++j) {
			sfb -= 32;
			dfb -= 32;
			__raw_writel(0xffffffff, sfb);
			wmb();
			__raw_writel(0xffffffff, dfb);
			wmb();
		}

		if (mask_last) {
			sfb -= 32;
			dfb -= 32;
			__raw_writel(mask_last, sfb);
			wmb();
			__raw_writel(mask_last, dfb);
			wmb();
		}

		sepos += yincr;
		depos += yincr;
	}

	/* Reset the MODE register to normal.  */
	__raw_writel(TGA_MODE_SBM_8BPP|TGA_MODE_SIMPLE, tga_regs+TGA_MODE_REG);
}

static void
tgafb_copyarea(struct fb_info *info, const struct fb_copyarea *area) 
{
	unsigned long dx, dy, width, height, sx, sy, vxres, vyres;
	unsigned long line_length, bpp;

	dx = area->dx;
	dy = area->dy;
	width = area->width;
	height = area->height;
	sx = area->sx;
	sy = area->sy;
	vxres = info->var.xres_virtual;
	vyres = info->var.yres_virtual;
	line_length = info->fix.line_length;

	/* The top left corners must be in the virtual screen.  */
	if (dx > vxres || sx > vxres || dy > vyres || sy > vyres)
		return;

	/* Clip the destination.  */
	if (dx + width > vxres)
		width = vxres - dx;
	if (dy + height > vyres)
		height = vyres - dy;

	/* The source must be completely inside the virtual screen.  */
	if (sx + width > vxres || sy + height > vyres)
		return;

	bpp = info->var.bits_per_pixel;

	/* Detect copies of the entire line.  */
	if (width * (bpp >> 3) == line_length) {
		if (bpp == 8)
			copyarea_line_8bpp(info, dy, sy, height, width);
		else
			copyarea_line_32bpp(info, dy, sy, height, width);
	}

	/* ??? The documentation is unclear to me exactly how the pixelshift
	   register works in 32bpp mode.  Since I don't have hardware to test,
	   give up for now and fall back on the generic routines.  */
	else if (bpp == 32)
		cfb_copyarea(info, area);

	/* Detect overlapping source and destination that requires
	   a backward copy.  */
	else if (dy == sy && dx > sx && dx < sx + width)
		copyarea_backward_8bpp(info, dx, dy, sx, sy, height,
				       width, line_length, area);
	else
		copyarea_foreward_8bpp(info, dx, dy, sx, sy, height,
				       width, line_length);
}


/*
 *  Initialisation
 */

static void
tgafb_init_fix(struct fb_info *info)
{
	struct tga_par *par = (struct tga_par *)info->par;
	int tga_bus_pci = TGA_BUS_PCI(par->dev);
	int tga_bus_tc = TGA_BUS_TC(par->dev);
	u8 tga_type = par->tga_type;
	const char *tga_type_name = NULL;

	switch (tga_type) {
	case TGA_TYPE_8PLANE:
		if (tga_bus_pci)
			tga_type_name = "Digital ZLXp-E1";
		if (tga_bus_tc)
			tga_type_name = "Digital ZLX-E1";
		break;
	case TGA_TYPE_24PLANE:
		if (tga_bus_pci)
			tga_type_name = "Digital ZLXp-E2";
		if (tga_bus_tc)
			tga_type_name = "Digital ZLX-E2";
		break;
	case TGA_TYPE_24PLUSZ:
		if (tga_bus_pci)
			tga_type_name = "Digital ZLXp-E3";
		if (tga_bus_tc)
			tga_type_name = "Digital ZLX-E3";
		break;
	default:
		tga_type_name = "Unknown";
		break;
	}

	strlcpy(info->fix.id, tga_type_name, sizeof(info->fix.id));

	info->fix.type = FB_TYPE_PACKED_PIXELS;
	info->fix.type_aux = 0;
	info->fix.visual = (tga_type == TGA_TYPE_8PLANE
			    ? FB_VISUAL_PSEUDOCOLOR
			    : FB_VISUAL_DIRECTCOLOR);

	info->fix.line_length = par->xres * (par->bits_per_pixel >> 3);
	info->fix.smem_start = (size_t) par->tga_fb_base;
	info->fix.smem_len = info->fix.line_length * par->yres;
	info->fix.mmio_start = (size_t) par->tga_regs_base;
	info->fix.mmio_len = 512;

	info->fix.xpanstep = 0;
	info->fix.ypanstep = 0;
	info->fix.ywrapstep = 0;

	info->fix.accel = FB_ACCEL_DEC_TGA;

	/*
	 * These are needed by fb_set_logo_truepalette(), so we
	 * set them here for 24-plane cards.
	 */
	if (tga_type != TGA_TYPE_8PLANE) {
		info->var.red.length = 8;
		info->var.green.length = 8;
		info->var.blue.length = 8;
		info->var.red.offset = 16;
		info->var.green.offset = 8;
		info->var.blue.offset = 0;
	}
}

static int tgafb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
{
	/* We just use this to catch switches out of graphics mode. */
	tgafb_set_par(info); /* A bit of overkill for BASE_ADDR reset. */
	return 0;
}

static int __devinit
tgafb_register(struct device *dev)
{
	static const struct fb_videomode modedb_tc = {
		/* 1280x1024 @ 72 Hz, 76.8 kHz hsync */
		"1280x1024@72", 0, 1280, 1024, 7645, 224, 28, 33, 3, 160, 3,
		FB_SYNC_ON_GREEN, FB_VMODE_NONINTERLACED
	};

	static unsigned int const fb_offset_presets[4] = {
		TGA_8PLANE_FB_OFFSET,
		TGA_24PLANE_FB_OFFSET,
		0xffffffff,
		TGA_24PLUSZ_FB_OFFSET
	};

	const struct fb_videomode *modedb_tga = NULL;
	resource_size_t bar0_start = 0, bar0_len = 0;
	const char *mode_option_tga = NULL;
	int tga_bus_pci = TGA_BUS_PCI(dev);
	int tga_bus_tc = TGA_BUS_TC(dev);
	unsigned int modedbsize_tga = 0;
	void __iomem *mem_base;
	struct fb_info *info;
	struct tga_par *par;
	u8 tga_type;
	int ret = 0;

	/* Enable device in PCI config.  */
	if (tga_bus_pci && pci_enable_device(to_pci_dev(dev))) {
		printk(KERN_ERR "tgafb: Cannot enable PCI device\n");
		return -ENODEV;
	}

	/* Allocate the fb and par structures.  */
	info = framebuffer_alloc(sizeof(struct tga_par), dev);
	if (!info) {
		printk(KERN_ERR "tgafb: Cannot allocate memory\n");
		return -ENOMEM;
	}

	par = info->par;
	dev_set_drvdata(dev, info);

	/* Request the mem regions.  */
	ret = -ENODEV;
	if (tga_bus_pci) {
		bar0_start = pci_resource_start(to_pci_dev(dev), 0);
		bar0_len = pci_resource_len(to_pci_dev(dev), 0);
	}
	if (tga_bus_tc) {
		bar0_start = to_tc_dev(dev)->resource.start;
		bar0_len = to_tc_dev(dev)->resource.end - bar0_start + 1;
	}
	if (!request_mem_region (bar0_start, bar0_len, "tgafb")) {
		printk(KERN_ERR "tgafb: cannot reserve FB region\n");
		goto err0;
	}

	/* Map the framebuffer.  */
	mem_base = ioremap_nocache(bar0_start, bar0_len);
	if (!mem_base) {
		printk(KERN_ERR "tgafb: Cannot map MMIO\n");
		goto err1;
	}

	/* Grab info about the card.  */
	tga_type = (readl(mem_base) >> 12) & 0x0f;
	par->dev = dev;
	par->tga_mem_base = mem_base;
	par->tga_fb_base = mem_base + fb_offset_presets[tga_type];
	par->tga_regs_base = mem_base + TGA_REGS_OFFSET;
	par->tga_type = tga_type;
	if (tga_bus_pci)
		par->tga_chip_rev = (to_pci_dev(dev))->revision;
	if (tga_bus_tc)
		par->tga_chip_rev = TGA_READ_REG(par, TGA_START_REG) & 0xff;

	/* Setup framebuffer.  */
	info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_COPYAREA |
		      FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT;
	info->fbops = &tgafb_ops;
	info->screen_base = par->tga_fb_base;
	info->pseudo_palette = par->palette;

	/* This should give a reasonable default video mode.  */
	if (tga_bus_pci) {
		mode_option_tga = mode_option_pci;
	}
	if (tga_bus_tc) {
		mode_option_tga = mode_option_tc;
		modedb_tga = &modedb_tc;
		modedbsize_tga = 1;
	}
	ret = fb_find_mode(&info->var, info,
			   mode_option ? mode_option : mode_option_tga,
			   modedb_tga, modedbsize_tga, NULL,
			   tga_type == TGA_TYPE_8PLANE ? 8 : 32);
	if (ret == 0 || ret == 4) {
		printk(KERN_ERR "tgafb: Could not find valid video mode\n");
		ret = -EINVAL;
		goto err1;
	}

	if (fb_alloc_cmap(&info->cmap, 256, 0)) {
		printk(KERN_ERR "tgafb: Could not allocate color map\n");
		ret = -ENOMEM;
		goto err1;
	}

	tgafb_set_par(info);
	tgafb_init_fix(info);

	if (register_framebuffer(info) < 0) {
		printk(KERN_ERR "tgafb: Could not register framebuffer\n");
		ret = -EINVAL;
		goto err2;
	}

	if (tga_bus_pci) {
		pr_info("tgafb: DC21030 [TGA] detected, rev=0x%02x\n",
			par->tga_chip_rev);
		pr_info("tgafb: at PCI bus %d, device %d, function %d\n",
			to_pci_dev(dev)->bus->number,
			PCI_SLOT(to_pci_dev(dev)->devfn),
			PCI_FUNC(to_pci_dev(dev)->devfn));
	}
	if (tga_bus_tc)
		pr_info("tgafb: SFB+ detected, rev=0x%02x\n",
			par->tga_chip_rev);
	pr_info("fb%d: %s frame buffer device at 0x%lx\n",
		info->node, info->fix.id, (long)bar0_start);

	return 0;

 err2:
	fb_dealloc_cmap(&info->cmap);
 err1:
	if (mem_base)
		iounmap(mem_base);
	release_mem_region(bar0_start, bar0_len);
 err0:
	framebuffer_release(info);
	return ret;
}

static void __devexit
tgafb_unregister(struct device *dev)
{
	resource_size_t bar0_start = 0, bar0_len = 0;
	int tga_bus_pci = TGA_BUS_PCI(dev);
	int tga_bus_tc = TGA_BUS_TC(dev);
	struct fb_info *info = NULL;
	struct tga_par *par;

	info = dev_get_drvdata(dev);
	if (!info)
		return;

	par = info->par;
	unregister_framebuffer(info);
	fb_dealloc_cmap(&info->cmap);
	iounmap(par->tga_mem_base);
	if (tga_bus_pci) {
		bar0_start = pci_resource_start(to_pci_dev(dev), 0);
		bar0_len = pci_resource_len(to_pci_dev(dev), 0);
	}
	if (tga_bus_tc) {
		bar0_start = to_tc_dev(dev)->resource.start;
		bar0_len = to_tc_dev(dev)->resource.end - bar0_start + 1;
	}
	release_mem_region(bar0_start, bar0_len);
	framebuffer_release(info);
}

static void __devexit
tgafb_exit(void)
{
	tc_unregister_driver(&tgafb_tc_driver);
	pci_unregister_driver(&tgafb_pci_driver);
}

#ifndef MODULE
static int __devinit
tgafb_setup(char *arg)
{
	char *this_opt;

	if (arg && *arg) {
		while ((this_opt = strsep(&arg, ","))) {
			if (!*this_opt)
				continue;
			if (!strncmp(this_opt, "mode:", 5))
				mode_option = this_opt+5;
			else
				printk(KERN_ERR
				       "tgafb: unknown parameter %s\n",
				       this_opt);
		}
	}

	return 0;
}
#endif /* !MODULE */

static int __devinit
tgafb_init(void)
{
	int status;
#ifndef MODULE
	char *option = NULL;

	if (fb_get_options("tgafb", &option))
		return -ENODEV;
	tgafb_setup(option);
#endif
	status = pci_register_driver(&tgafb_pci_driver);
	if (!status)
		status = tc_register_driver(&tgafb_tc_driver);
	return status;
}

/*
 *  Modularisation
 */

module_init(tgafb_init);
module_exit(tgafb_exit);

MODULE_DESCRIPTION("Framebuffer driver for TGA/SFB+ chipset");
MODULE_LICENSE("GPL");