From bb3b2cfeb206f5b10b859e134651b54120e3f530 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linusw@kernel.org>
Date: Tue, 30 Jun 2026 18:05:56 +0100
Subject: ARM: 9480/1: entry: expand comment in __switch_to

As per discussion between the developers in the mail thread
linked, expand the comment in __switch_to so that readers
of the code understand what is going on.

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/video/fbdev/tgafb.c | 1629 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1629 insertions(+)
 create mode 100644 drivers/video/fbdev/tgafb.c

(limited to 'drivers/video/fbdev/tgafb.c')

diff --git a/drivers/video/fbdev/tgafb.c b/drivers/video/fbdev/tgafb.c
new file mode 100644
index 000000000..dccfc38cf
--- /dev/null
+++ b/drivers/video/fbdev/tgafb.c
@@ -0,0 +1,1629 @@
+/*
+ *  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/aperture.h>
+#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_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 tgafb_register(struct device *dev);
+static void 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 const struct fb_ops tgafb_ops = {
+	.owner			= THIS_MODULE,
+	__FB_DEFAULT_IOMEM_OPS_RDWR,
+	.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,
+	__FB_DEFAULT_IOMEM_OPS_MMAP,
+};
+
+
+#ifdef CONFIG_PCI
+/*
+ *  PCI registration operations
+ */
+static int tgafb_pci_register(struct pci_dev *, const struct pci_device_id *);
+static void 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			= tgafb_pci_unregister,
+};
+
+static int tgafb_pci_register(struct pci_dev *pdev,
+			      const struct pci_device_id *ent)
+{
+	int ret;
+
+	ret = aperture_remove_conflicting_pci_devices(pdev, "tgafb");
+	if (ret)
+		return ret;
+
+	return tgafb_register(&pdev->dev);
+}
+
+static void tgafb_pci_unregister(struct pci_dev *pdev)
+{
+	tgafb_unregister(&pdev->dev);
+}
+#endif /* CONFIG_PCI */
+
+#ifdef CONFIG_TC
+/*
+ *  TC registration operations
+ */
+static int tgafb_tc_register(struct device *);
+static int 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		= tgafb_tc_unregister,
+	},
+};
+
+static int tgafb_tc_register(struct device *dev)
+{
+	int status = tgafb_register(dev);
+	if (!status)
+		get_device(dev);
+	return status;
+}
+
+static int 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 (!var->pixclock)
+		return -EINVAL;
+
+	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->xres * var->yres * (var->bits_per_pixel >> 3) > info->fix.smem_len)
+		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 8 bytes.  */
+	if (var->xres * (par->tga_type == TGA_TYPE_8PLANE ? 1 : 4) % 8)
+		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 = dev_is_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;
+	info->fix.line_length = par->xres * (par->bits_per_pixel >> 3);
+
+	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_VT
+		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 = dev_is_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: 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 *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;
+
+	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 (almost) general case of backward copy in 8bpp mode.  */
+static inline void
+copyarea_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 i, yincr;
+	int depos, sepos, backward, last_step, step;
+	u32 mask_last;
+	unsigned n32;
+	void __iomem *tga_regs;
+	void __iomem *tga_fb;
+
+	/* Do acceleration only if we are aligned on 8 pixels */
+	if ((dx | sx | width) & 7) {
+		cfb_copyarea(info, area);
+		return;
+	}
+
+	yincr = line_length;
+	if (dy > sy) {
+		dy += height - 1;
+		sy += height - 1;
+		yincr = -yincr;
+	}
+	backward = dy == sy && dx > sx && dx < sx + width;
+
+	/* Compute the offsets and alignments in the frame buffer.
+	   More than anything else, these control how we do copies.  */
+	depos = dy * line_length + dx;
+	sepos = sy * line_length + sx;
+	if (backward) {
+		depos += width;
+		sepos += width;
+	}
+
+	/* Next copy full words at a time.  */
+	n32 = width / 32;
+	last_step = width % 32;
+
+	/* Finally copy the unaligned head of the span.  */
+	mask_last = (1ul << last_step) - 1;
+
+	if (!backward) {
+		step = 32;
+		last_step = 32;
+	} else {
+		step = -32;
+		last_step = -last_step;
+		sepos -= 32;
+		depos -= 32;
+	}
+
+	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;
+
+		for (j = 0; j < n32; j++) {
+			if (j < 2 && j + 1 < n32 && !backward &&
+			    !(((unsigned long)sfb | (unsigned long)dfb) & 63)) {
+				do {
+					__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;
+					j += 2;
+				} while (j + 1 < n32);
+				j--;
+				continue;
+			}
+			__raw_writel(0xffffffff, sfb);
+			wmb();
+			__raw_writel(0xffffffff, dfb);
+			wmb();
+			sfb += step;
+			dfb += step;
+		}
+
+		if (mask_last) {
+			sfb += last_step - step;
+			dfb += last_step - step;
+			__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 (!(line_length & 63) && 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);
+
+	else
+		copyarea_8bpp(info, dx, dy, sx, sy, height,
+			      width, line_length, area);
+}
+
+
+/*
+ *  Initialisation
+ */
+
+static void
+tgafb_init_fix(struct fb_info *info)
+{
+	struct tga_par *par = (struct tga_par *)info->par;
+	int tga_bus_pci = dev_is_pci(par->dev);
+	int tga_bus_tc = TGA_BUS_TC(par->dev);
+	u8 tga_type = par->tga_type;
+	const char *tga_type_name = NULL;
+	unsigned memory_size;
+
+	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";
+		memory_size = 2097152;
+		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";
+		memory_size = 8388608;
+		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";
+		memory_size = 16777216;
+		break;
+	}
+	if (!tga_type_name) {
+		tga_type_name = "Unknown";
+		memory_size = 16777216;
+	}
+
+	strscpy(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.smem_start = (size_t) par->tga_fb_base;
+	info->fix.smem_len = memory_size;
+	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 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 = dev_is_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)
+		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(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_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;
+	}
+
+	tgafb_init_fix(info);
+
+	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);
+
+	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);
+	fb_info(info, "%s frame buffer device at 0x%lx\n",
+		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 tgafb_unregister(struct device *dev)
+{
+	resource_size_t bar0_start = 0, bar0_len = 0;
+	int tga_bus_pci = dev_is_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 tgafb_exit(void)
+{
+	tc_unregister_driver(&tgafb_tc_driver);
+	pci_unregister_driver(&tgafb_pci_driver);
+}
+
+#ifndef MODULE
+static int 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 tgafb_init(void)
+{
+	int status;
+#ifndef MODULE
+	char *option = NULL;
+#endif
+
+	if (fb_modesetting_disabled("tgafb"))
+		return -ENODEV;
+
+#ifndef MODULE
+	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");
-- 
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