From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001
From: Shivank Garg <shivankg@amd.com>
Date: Sat, 22 Aug 2026 19:22:05 +0000
Subject: dmaengine: fix use-after-free in dma_chan_put() and
 dma_release_channel()

When dma_device_put() drops the last reference on chan->device->ref,
dma_device_release() runs and may free the dma_device along with its
channels.

dma_chan_put() then still reads chan->device->owner via
dma_chan_to_owner() for the trailing module_put(). KASAN catches it:

	slab-use-after-free in dma_chan_put+0x3e6/0x4c0
	Read of size 8 by task insmod/6319
	Freed by task 6319:
	  kfree+0x225/0x470
	  dma_chan_put+0x395/0x4c0
	  dmaengine_put+0xf8/0x160

Cache the module owner in dma_chan_put() before the put so the trailing
module_put() does not need chan->device.

Fixes: 8ad342a86359 ("dmaengine: Add reference counting to dma_device struct")
Suggested-by: Sashiko <sashiko-bot@kernel.org>
Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Shivank Garg <shivankg@amd.com>
Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
---
 drivers/video/fbdev/pm3fb.c | 1578 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1578 insertions(+)
 create mode 100644 drivers/video/fbdev/pm3fb.c

(limited to 'drivers/video/fbdev/pm3fb.c')

diff --git a/drivers/video/fbdev/pm3fb.c b/drivers/video/fbdev/pm3fb.c
new file mode 100644
index 000000000..6f552ae36
--- /dev/null
+++ b/drivers/video/fbdev/pm3fb.c
@@ -0,0 +1,1578 @@
+/*
+ *  linux/drivers/video/pm3fb.c -- 3DLabs Permedia3 frame buffer device
+ *
+ *  Copyright (C) 2001 Romain Dolbeau <romain@dolbeau.org>.
+ *
+ *  Ported to 2.6 kernel on 1 May 2007 by Krzysztof Helt <krzysztof.h1@wp.pl>
+ *	based on pm2fb.c
+ *
+ *  Based on code written by:
+ *	   Sven Luther, <luther@dpt-info.u-strasbg.fr>
+ *	   Alan Hourihane, <alanh@fairlite.demon.co.uk>
+ *	   Russell King, <rmk@arm.linux.org.uk>
+ *  Based on linux/drivers/video/skeletonfb.c:
+ *	Copyright (C) 1997 Geert Uytterhoeven
+ *  Based on linux/driver/video/pm2fb.c:
+ *	Copyright (C) 1998-1999 Ilario Nardinocchi (nardinoc@CS.UniBO.IT)
+ *	Copyright (C) 1999 Jakub Jelinek (jakub@redhat.com)
+ *
+ *  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/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+
+#include <video/pm3fb.h>
+
+#if !defined(CONFIG_PCI)
+#error "Only generic PCI cards supported."
+#endif
+
+#undef PM3FB_MASTER_DEBUG
+#ifdef PM3FB_MASTER_DEBUG
+#define DPRINTK(a, b...)	\
+	printk(KERN_DEBUG "pm3fb: %s: " a, __func__ , ## b)
+#else
+#define DPRINTK(a, b...)	no_printk(a, ##b)
+#endif
+
+#define PM3_PIXMAP_SIZE	(2048 * 4)
+
+/*
+ * Driver data
+ */
+static int hwcursor = 1;
+static char *mode_option;
+static bool noaccel;
+static bool nomtrr;
+
+/*
+ * This structure defines the hardware state of the graphics card. Normally
+ * you place this in a header file in linux/include/video. This file usually
+ * also includes register information. That allows other driver subsystems
+ * and userland applications the ability to use the same header file to
+ * avoid duplicate work and easy porting of software.
+ */
+struct pm3_par {
+	unsigned char	__iomem *v_regs;/* virtual address of p_regs */
+	u32		video;		/* video flags before blanking */
+	u32		base;		/* screen base in 128 bits unit */
+	u32		palette[16];
+	int		wc_cookie;
+};
+
+/*
+ * Here we define the default structs fb_fix_screeninfo and fb_var_screeninfo
+ * if we don't use modedb. If we do use modedb see pm3fb_init how to use it
+ * to get a fb_var_screeninfo. Otherwise define a default var as well.
+ */
+static struct fb_fix_screeninfo pm3fb_fix = {
+	.id =		"Permedia3",
+	.type =		FB_TYPE_PACKED_PIXELS,
+	.visual =	FB_VISUAL_PSEUDOCOLOR,
+	.xpanstep =	1,
+	.ypanstep =	1,
+	.ywrapstep =	0,
+	.accel =	FB_ACCEL_3DLABS_PERMEDIA3,
+};
+
+/*
+ * Utility functions
+ */
+
+static inline u32 PM3_READ_REG(struct pm3_par *par, s32 off)
+{
+	return fb_readl(par->v_regs + off);
+}
+
+static inline void PM3_WRITE_REG(struct pm3_par *par, s32 off, u32 v)
+{
+	fb_writel(v, par->v_regs + off);
+}
+
+static inline void PM3_WAIT(struct pm3_par *par, u32 n)
+{
+	while (PM3_READ_REG(par, PM3InFIFOSpace) < n)
+		cpu_relax();
+}
+
+static inline void PM3_WRITE_DAC_REG(struct pm3_par *par, unsigned r, u8 v)
+{
+	PM3_WAIT(par, 3);
+	PM3_WRITE_REG(par, PM3RD_IndexHigh, (r >> 8) & 0xff);
+	PM3_WRITE_REG(par, PM3RD_IndexLow, r & 0xff);
+	wmb();
+	PM3_WRITE_REG(par, PM3RD_IndexedData, v);
+	wmb();
+}
+
+static inline void pm3fb_set_color(struct pm3_par *par, unsigned char regno,
+			unsigned char r, unsigned char g, unsigned char b)
+{
+	PM3_WAIT(par, 4);
+	PM3_WRITE_REG(par, PM3RD_PaletteWriteAddress, regno);
+	wmb();
+	PM3_WRITE_REG(par, PM3RD_PaletteData, r);
+	wmb();
+	PM3_WRITE_REG(par, PM3RD_PaletteData, g);
+	wmb();
+	PM3_WRITE_REG(par, PM3RD_PaletteData, b);
+	wmb();
+}
+
+static void pm3fb_clear_colormap(struct pm3_par *par,
+			unsigned char r, unsigned char g, unsigned char b)
+{
+	int i;
+
+	for (i = 0; i < 256 ; i++)
+		pm3fb_set_color(par, i, r, g, b);
+
+}
+
+/* Calculating various clock parameters */
+static void pm3fb_calculate_clock(unsigned long reqclock,
+				unsigned char *prescale,
+				unsigned char *feedback,
+				unsigned char *postscale)
+{
+	int f, pre, post;
+	unsigned long freq;
+	long freqerr = 1000;
+	long currerr;
+
+	for (f = 1; f < 256; f++) {
+		for (pre = 1; pre < 256; pre++) {
+			for (post = 0; post < 5; post++) {
+				freq = ((2*PM3_REF_CLOCK * f) >> post) / pre;
+				currerr = (reqclock > freq)
+					? reqclock - freq
+					: freq - reqclock;
+				if (currerr < freqerr) {
+					freqerr = currerr;
+					*feedback = f;
+					*prescale = pre;
+					*postscale = post;
+				}
+			}
+		}
+	}
+}
+
+static inline int pm3fb_depth(const struct fb_var_screeninfo *var)
+{
+	if (var->bits_per_pixel == 16)
+		return var->red.length + var->green.length
+			+ var->blue.length;
+
+	return var->bits_per_pixel;
+}
+
+static inline int pm3fb_shift_bpp(unsigned bpp, int v)
+{
+	switch (bpp) {
+	case 8:
+		return (v >> 4);
+	case 16:
+		return (v >> 3);
+	case 32:
+		return (v >> 2);
+	}
+	DPRINTK("Unsupported depth %u\n", bpp);
+	return 0;
+}
+
+/* acceleration */
+static int pm3fb_sync(struct fb_info *info)
+{
+	struct pm3_par *par = info->par;
+
+	PM3_WAIT(par, 2);
+	PM3_WRITE_REG(par, PM3FilterMode, PM3FilterModeSync);
+	PM3_WRITE_REG(par, PM3Sync, 0);
+	mb();
+	do {
+		while ((PM3_READ_REG(par, PM3OutFIFOWords)) == 0)
+			cpu_relax();
+	} while ((PM3_READ_REG(par, PM3OutputFifo)) != PM3Sync_Tag);
+
+	return 0;
+}
+
+static void pm3fb_init_engine(struct fb_info *info)
+{
+	struct pm3_par *par = info->par;
+	const u32 width = (info->var.xres_virtual + 7) & ~7;
+
+	PM3_WAIT(par, 50);
+	PM3_WRITE_REG(par, PM3FilterMode, PM3FilterModeSync);
+	PM3_WRITE_REG(par, PM3StatisticMode, 0x0);
+	PM3_WRITE_REG(par, PM3DeltaMode, 0x0);
+	PM3_WRITE_REG(par, PM3RasterizerMode, 0x0);
+	PM3_WRITE_REG(par, PM3ScissorMode, 0x0);
+	PM3_WRITE_REG(par, PM3LineStippleMode, 0x0);
+	PM3_WRITE_REG(par, PM3AreaStippleMode, 0x0);
+	PM3_WRITE_REG(par, PM3GIDMode, 0x0);
+	PM3_WRITE_REG(par, PM3DepthMode, 0x0);
+	PM3_WRITE_REG(par, PM3StencilMode, 0x0);
+	PM3_WRITE_REG(par, PM3StencilData, 0x0);
+	PM3_WRITE_REG(par, PM3ColorDDAMode, 0x0);
+	PM3_WRITE_REG(par, PM3TextureCoordMode, 0x0);
+	PM3_WRITE_REG(par, PM3TextureIndexMode0, 0x0);
+	PM3_WRITE_REG(par, PM3TextureIndexMode1, 0x0);
+	PM3_WRITE_REG(par, PM3TextureReadMode, 0x0);
+	PM3_WRITE_REG(par, PM3LUTMode, 0x0);
+	PM3_WRITE_REG(par, PM3TextureFilterMode, 0x0);
+	PM3_WRITE_REG(par, PM3TextureCompositeMode, 0x0);
+	PM3_WRITE_REG(par, PM3TextureApplicationMode, 0x0);
+	PM3_WRITE_REG(par, PM3TextureCompositeColorMode1, 0x0);
+	PM3_WRITE_REG(par, PM3TextureCompositeAlphaMode1, 0x0);
+	PM3_WRITE_REG(par, PM3TextureCompositeColorMode0, 0x0);
+	PM3_WRITE_REG(par, PM3TextureCompositeAlphaMode0, 0x0);
+	PM3_WRITE_REG(par, PM3FogMode, 0x0);
+	PM3_WRITE_REG(par, PM3ChromaTestMode, 0x0);
+	PM3_WRITE_REG(par, PM3AlphaTestMode, 0x0);
+	PM3_WRITE_REG(par, PM3AntialiasMode, 0x0);
+	PM3_WRITE_REG(par, PM3YUVMode, 0x0);
+	PM3_WRITE_REG(par, PM3AlphaBlendColorMode, 0x0);
+	PM3_WRITE_REG(par, PM3AlphaBlendAlphaMode, 0x0);
+	PM3_WRITE_REG(par, PM3DitherMode, 0x0);
+	PM3_WRITE_REG(par, PM3LogicalOpMode, 0x0);
+	PM3_WRITE_REG(par, PM3RouterMode, 0x0);
+	PM3_WRITE_REG(par, PM3Window, 0x0);
+
+	PM3_WRITE_REG(par, PM3Config2D, 0x0);
+
+	PM3_WRITE_REG(par, PM3SpanColorMask, 0xffffffff);
+
+	PM3_WRITE_REG(par, PM3XBias, 0x0);
+	PM3_WRITE_REG(par, PM3YBias, 0x0);
+	PM3_WRITE_REG(par, PM3DeltaControl, 0x0);
+
+	PM3_WRITE_REG(par, PM3BitMaskPattern, 0xffffffff);
+
+	PM3_WRITE_REG(par, PM3FBDestReadEnables,
+			   PM3FBDestReadEnables_E(0xff) |
+			   PM3FBDestReadEnables_R(0xff) |
+			   PM3FBDestReadEnables_ReferenceAlpha(0xff));
+	PM3_WRITE_REG(par, PM3FBDestReadBufferAddr0, 0x0);
+	PM3_WRITE_REG(par, PM3FBDestReadBufferOffset0, 0x0);
+	PM3_WRITE_REG(par, PM3FBDestReadBufferWidth0,
+			   PM3FBDestReadBufferWidth_Width(width));
+
+	PM3_WRITE_REG(par, PM3FBDestReadMode,
+			   PM3FBDestReadMode_ReadEnable |
+			   PM3FBDestReadMode_Enable0);
+	PM3_WRITE_REG(par, PM3FBSourceReadBufferAddr, 0x0);
+	PM3_WRITE_REG(par, PM3FBSourceReadBufferOffset, 0x0);
+	PM3_WRITE_REG(par, PM3FBSourceReadBufferWidth,
+			   PM3FBSourceReadBufferWidth_Width(width));
+	PM3_WRITE_REG(par, PM3FBSourceReadMode,
+			   PM3FBSourceReadMode_Blocking |
+			   PM3FBSourceReadMode_ReadEnable);
+
+	PM3_WAIT(par, 2);
+	{
+		/* invert bits in bitmask */
+		unsigned long rm = 1 | (3 << 7);
+		switch (info->var.bits_per_pixel) {
+		case 8:
+			PM3_WRITE_REG(par, PM3PixelSize,
+					   PM3PixelSize_GLOBAL_8BIT);
+#ifdef __BIG_ENDIAN
+			rm |= 3 << 15;
+#endif
+			break;
+		case 16:
+			PM3_WRITE_REG(par, PM3PixelSize,
+					   PM3PixelSize_GLOBAL_16BIT);
+#ifdef __BIG_ENDIAN
+			rm |= 2 << 15;
+#endif
+			break;
+		case 32:
+			PM3_WRITE_REG(par, PM3PixelSize,
+					   PM3PixelSize_GLOBAL_32BIT);
+			break;
+		default:
+			DPRINTK("Unsupported depth %d\n",
+				info->var.bits_per_pixel);
+			break;
+		}
+		PM3_WRITE_REG(par, PM3RasterizerMode, rm);
+	}
+
+	PM3_WAIT(par, 20);
+	PM3_WRITE_REG(par, PM3FBSoftwareWriteMask, 0xffffffff);
+	PM3_WRITE_REG(par, PM3FBHardwareWriteMask, 0xffffffff);
+	PM3_WRITE_REG(par, PM3FBWriteMode,
+			   PM3FBWriteMode_WriteEnable |
+			   PM3FBWriteMode_OpaqueSpan |
+			   PM3FBWriteMode_Enable0);
+	PM3_WRITE_REG(par, PM3FBWriteBufferAddr0, 0x0);
+	PM3_WRITE_REG(par, PM3FBWriteBufferOffset0, 0x0);
+	PM3_WRITE_REG(par, PM3FBWriteBufferWidth0,
+			   PM3FBWriteBufferWidth_Width(width));
+
+	PM3_WRITE_REG(par, PM3SizeOfFramebuffer, 0x0);
+	{
+		/* size in lines of FB */
+		unsigned long sofb = info->screen_size /
+			info->fix.line_length;
+		if (sofb > 4095)
+			PM3_WRITE_REG(par, PM3SizeOfFramebuffer, 4095);
+		else
+			PM3_WRITE_REG(par, PM3SizeOfFramebuffer, sofb);
+
+		switch (info->var.bits_per_pixel) {
+		case 8:
+			PM3_WRITE_REG(par, PM3DitherMode,
+					   (1 << 10) | (2 << 3));
+			break;
+		case 16:
+			PM3_WRITE_REG(par, PM3DitherMode,
+					   (1 << 10) | (1 << 3));
+			break;
+		case 32:
+			PM3_WRITE_REG(par, PM3DitherMode,
+					   (1 << 10) | (0 << 3));
+			break;
+		default:
+			DPRINTK("Unsupported depth %d\n",
+				info->var.bits_per_pixel);
+			break;
+		}
+	}
+
+	PM3_WRITE_REG(par, PM3dXDom, 0x0);
+	PM3_WRITE_REG(par, PM3dXSub, 0x0);
+	PM3_WRITE_REG(par, PM3dY, 1 << 16);
+	PM3_WRITE_REG(par, PM3StartXDom, 0x0);
+	PM3_WRITE_REG(par, PM3StartXSub, 0x0);
+	PM3_WRITE_REG(par, PM3StartY, 0x0);
+	PM3_WRITE_REG(par, PM3Count, 0x0);
+
+/* Disable LocalBuffer. better safe than sorry */
+	PM3_WRITE_REG(par, PM3LBDestReadMode, 0x0);
+	PM3_WRITE_REG(par, PM3LBDestReadEnables, 0x0);
+	PM3_WRITE_REG(par, PM3LBSourceReadMode, 0x0);
+	PM3_WRITE_REG(par, PM3LBWriteMode, 0x0);
+
+	pm3fb_sync(info);
+}
+
+static void pm3fb_fillrect(struct fb_info *info,
+				const struct fb_fillrect *region)
+{
+	struct pm3_par *par = info->par;
+	struct fb_fillrect modded;
+	int vxres, vyres;
+	int rop;
+	u32 color = (info->fix.visual == FB_VISUAL_TRUECOLOR) ?
+		((u32 *)info->pseudo_palette)[region->color] : region->color;
+
+	if (info->state != FBINFO_STATE_RUNNING)
+		return;
+	if (info->flags & FBINFO_HWACCEL_DISABLED) {
+		cfb_fillrect(info, region);
+		return;
+	}
+	if (region->rop == ROP_COPY )
+		rop = PM3Config2D_ForegroundROP(0x3); /* GXcopy */
+	else
+		rop = PM3Config2D_ForegroundROP(0x6) | /* GXxor */
+			PM3Config2D_FBDestReadEnable;
+
+	vxres = info->var.xres_virtual;
+	vyres = info->var.yres_virtual;
+
+	memcpy(&modded, region, sizeof(struct fb_fillrect));
+
+	if (!modded.width || !modded.height ||
+	    modded.dx >= vxres || modded.dy >= vyres)
+		return;
+
+	if (modded.dx + modded.width  > vxres)
+		modded.width  = vxres - modded.dx;
+	if (modded.dy + modded.height > vyres)
+		modded.height = vyres - modded.dy;
+
+	if (info->var.bits_per_pixel == 8)
+		color |= color << 8;
+	if (info->var.bits_per_pixel <= 16)
+		color |= color << 16;
+
+	PM3_WAIT(par, 4);
+	/* ROP Ox3 is GXcopy */
+	PM3_WRITE_REG(par, PM3Config2D,
+			PM3Config2D_UseConstantSource |
+			PM3Config2D_ForegroundROPEnable |
+			rop |
+			PM3Config2D_FBWriteEnable);
+
+	PM3_WRITE_REG(par, PM3ForegroundColor, color);
+
+	PM3_WRITE_REG(par, PM3RectanglePosition,
+			PM3RectanglePosition_XOffset(modded.dx) |
+			PM3RectanglePosition_YOffset(modded.dy));
+
+	PM3_WRITE_REG(par, PM3Render2D,
+		      PM3Render2D_XPositive |
+		      PM3Render2D_YPositive |
+		      PM3Render2D_Operation_Normal |
+		      PM3Render2D_SpanOperation |
+		      PM3Render2D_Width(modded.width) |
+		      PM3Render2D_Height(modded.height));
+}
+
+static void pm3fb_copyarea(struct fb_info *info,
+				const struct fb_copyarea *area)
+{
+	struct pm3_par *par = info->par;
+	struct fb_copyarea modded;
+	u32 vxres, vyres;
+	int x_align, o_x, o_y;
+
+	if (info->state != FBINFO_STATE_RUNNING)
+		return;
+	if (info->flags & FBINFO_HWACCEL_DISABLED) {
+		cfb_copyarea(info, area);
+		return;
+	}
+
+	memcpy(&modded, area, sizeof(struct fb_copyarea));
+
+	vxres = info->var.xres_virtual;
+	vyres = info->var.yres_virtual;
+
+	if (!modded.width || !modded.height ||
+	    modded.sx >= vxres || modded.sy >= vyres ||
+	    modded.dx >= vxres || modded.dy >= vyres)
+		return;
+
+	if (modded.sx + modded.width > vxres)
+		modded.width = vxres - modded.sx;
+	if (modded.dx + modded.width > vxres)
+		modded.width = vxres - modded.dx;
+	if (modded.sy + modded.height > vyres)
+		modded.height = vyres - modded.sy;
+	if (modded.dy + modded.height > vyres)
+		modded.height = vyres - modded.dy;
+
+	o_x = modded.sx - modded.dx;	/*(sx > dx ) ? (sx - dx) : (dx - sx); */
+	o_y = modded.sy - modded.dy;	/*(sy > dy ) ? (sy - dy) : (dy - sy); */
+
+	x_align = (modded.sx & 0x1f);
+
+	PM3_WAIT(par, 6);
+
+	PM3_WRITE_REG(par, PM3Config2D,
+			PM3Config2D_UserScissorEnable |
+			PM3Config2D_ForegroundROPEnable |
+			PM3Config2D_Blocking |
+			PM3Config2D_ForegroundROP(0x3) | /* Ox3 is GXcopy */
+			PM3Config2D_FBWriteEnable);
+
+	PM3_WRITE_REG(par, PM3ScissorMinXY,
+			((modded.dy & 0x0fff) << 16) | (modded.dx & 0x0fff));
+	PM3_WRITE_REG(par, PM3ScissorMaxXY,
+			(((modded.dy + modded.height) & 0x0fff) << 16) |
+			((modded.dx + modded.width) & 0x0fff));
+
+	PM3_WRITE_REG(par, PM3FBSourceReadBufferOffset,
+			PM3FBSourceReadBufferOffset_XOffset(o_x) |
+			PM3FBSourceReadBufferOffset_YOffset(o_y));
+
+	PM3_WRITE_REG(par, PM3RectanglePosition,
+			PM3RectanglePosition_XOffset(modded.dx - x_align) |
+			PM3RectanglePosition_YOffset(modded.dy));
+
+	PM3_WRITE_REG(par, PM3Render2D,
+			((modded.sx > modded.dx) ? PM3Render2D_XPositive : 0) |
+			((modded.sy > modded.dy) ? PM3Render2D_YPositive : 0) |
+			PM3Render2D_Operation_Normal |
+			PM3Render2D_SpanOperation |
+			PM3Render2D_FBSourceReadEnable |
+			PM3Render2D_Width(modded.width + x_align) |
+			PM3Render2D_Height(modded.height));
+}
+
+static void pm3fb_imageblit(struct fb_info *info, const struct fb_image *image)
+{
+	struct pm3_par *par = info->par;
+	u32 height = image->height;
+	u32 fgx, bgx;
+	const u32 *src = (const u32 *)image->data;
+
+	if (info->state != FBINFO_STATE_RUNNING)
+		return;
+	if (info->flags & FBINFO_HWACCEL_DISABLED) {
+		cfb_imageblit(info, image);
+		return;
+	}
+	switch (info->fix.visual) {
+	case FB_VISUAL_PSEUDOCOLOR:
+		fgx = image->fg_color;
+		bgx = image->bg_color;
+		break;
+	case FB_VISUAL_TRUECOLOR:
+	default:
+		fgx = par->palette[image->fg_color];
+		bgx = par->palette[image->bg_color];
+		break;
+	}
+	if (image->depth != 1) {
+		cfb_imageblit(info, image);
+		return;
+	}
+
+	if (info->var.bits_per_pixel == 8) {
+		fgx |= fgx << 8;
+		bgx |= bgx << 8;
+	}
+	if (info->var.bits_per_pixel <= 16) {
+		fgx |= fgx << 16;
+		bgx |= bgx << 16;
+	}
+
+	PM3_WAIT(par, 7);
+
+	PM3_WRITE_REG(par, PM3ForegroundColor, fgx);
+	PM3_WRITE_REG(par, PM3BackgroundColor, bgx);
+
+	/* ROP Ox3 is GXcopy */
+	PM3_WRITE_REG(par, PM3Config2D,
+			PM3Config2D_UserScissorEnable |
+			PM3Config2D_UseConstantSource |
+			PM3Config2D_ForegroundROPEnable |
+			PM3Config2D_ForegroundROP(0x3) |
+			PM3Config2D_OpaqueSpan |
+			PM3Config2D_FBWriteEnable);
+	PM3_WRITE_REG(par, PM3ScissorMinXY,
+			((image->dy & 0x0fff) << 16) | (image->dx & 0x0fff));
+	PM3_WRITE_REG(par, PM3ScissorMaxXY,
+			(((image->dy + image->height) & 0x0fff) << 16) |
+			((image->dx + image->width) & 0x0fff));
+	PM3_WRITE_REG(par, PM3RectanglePosition,
+			PM3RectanglePosition_XOffset(image->dx) |
+			PM3RectanglePosition_YOffset(image->dy));
+	PM3_WRITE_REG(par, PM3Render2D,
+			PM3Render2D_XPositive |
+			PM3Render2D_YPositive |
+			PM3Render2D_Operation_SyncOnBitMask |
+			PM3Render2D_SpanOperation |
+			PM3Render2D_Width(image->width) |
+			PM3Render2D_Height(image->height));
+
+
+	while (height--) {
+		int width = ((image->width + 7) >> 3)
+				+ info->pixmap.scan_align - 1;
+		width >>= 2;
+
+		while (width >= PM3_FIFO_SIZE) {
+			int i = PM3_FIFO_SIZE - 1;
+
+			PM3_WAIT(par, PM3_FIFO_SIZE);
+			while (i--) {
+				PM3_WRITE_REG(par, PM3BitMaskPattern, *src);
+				src++;
+			}
+			width -= PM3_FIFO_SIZE - 1;
+		}
+
+		PM3_WAIT(par, width + 1);
+		while (width--) {
+			PM3_WRITE_REG(par, PM3BitMaskPattern, *src);
+			src++;
+		}
+	}
+}
+/* end of acceleration functions */
+
+/*
+ *	Hardware Cursor support.
+ */
+static const u8 cursor_bits_lookup[16] = {
+	0x00, 0x40, 0x10, 0x50, 0x04, 0x44, 0x14, 0x54,
+	0x01, 0x41, 0x11, 0x51, 0x05, 0x45, 0x15, 0x55
+};
+
+static int pm3fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
+{
+	struct pm3_par *par = info->par;
+	u8 mode;
+
+	if (!hwcursor)
+		return -EINVAL;	/* just to force soft_cursor() call */
+
+	/* Too large of a cursor or wrong bpp :-( */
+	if (cursor->image.width > 64 ||
+	    cursor->image.height > 64 ||
+	    cursor->image.depth > 1)
+		return -EINVAL;
+
+	mode = PM3RD_CursorMode_TYPE_X;
+	if (cursor->enable)
+		 mode |= PM3RD_CursorMode_CURSOR_ENABLE;
+
+	PM3_WRITE_DAC_REG(par, PM3RD_CursorMode, mode);
+
+	/*
+	 * If the cursor is not be changed this means either we want the
+	 * current cursor state (if enable is set) or we want to query what
+	 * we can do with the cursor (if enable is not set)
+	 */
+	if (!cursor->set)
+		return 0;
+
+	if (cursor->set & FB_CUR_SETPOS) {
+		int x = cursor->image.dx - info->var.xoffset;
+		int y = cursor->image.dy - info->var.yoffset;
+
+		PM3_WRITE_DAC_REG(par, PM3RD_CursorXLow, x & 0xff);
+		PM3_WRITE_DAC_REG(par, PM3RD_CursorXHigh, (x >> 8) & 0xf);
+		PM3_WRITE_DAC_REG(par, PM3RD_CursorYLow, y & 0xff);
+		PM3_WRITE_DAC_REG(par, PM3RD_CursorYHigh, (y >> 8) & 0xf);
+	}
+
+	if (cursor->set & FB_CUR_SETHOT) {
+		PM3_WRITE_DAC_REG(par, PM3RD_CursorHotSpotX,
+				  cursor->hot.x & 0x3f);
+		PM3_WRITE_DAC_REG(par, PM3RD_CursorHotSpotY,
+				  cursor->hot.y & 0x3f);
+	}
+
+	if (cursor->set & FB_CUR_SETCMAP) {
+		u32 fg_idx = cursor->image.fg_color;
+		u32 bg_idx = cursor->image.bg_color;
+		struct fb_cmap cmap = info->cmap;
+
+		/* the X11 driver says one should use these color registers */
+		PM3_WRITE_DAC_REG(par, PM3RD_CursorPalette(39),
+				  cmap.red[fg_idx] >> 8 );
+		PM3_WRITE_DAC_REG(par, PM3RD_CursorPalette(40),
+				  cmap.green[fg_idx] >> 8 );
+		PM3_WRITE_DAC_REG(par, PM3RD_CursorPalette(41),
+				  cmap.blue[fg_idx] >> 8 );
+
+		PM3_WRITE_DAC_REG(par, PM3RD_CursorPalette(42),
+				  cmap.red[bg_idx] >> 8 );
+		PM3_WRITE_DAC_REG(par, PM3RD_CursorPalette(43),
+				  cmap.green[bg_idx] >> 8 );
+		PM3_WRITE_DAC_REG(par, PM3RD_CursorPalette(44),
+				  cmap.blue[bg_idx] >> 8 );
+	}
+
+	if (cursor->set & (FB_CUR_SETSHAPE | FB_CUR_SETIMAGE)) {
+		u8 *bitmap = (u8 *)cursor->image.data;
+		u8 *mask = (u8 *)cursor->mask;
+		int i;
+		int pos = PM3RD_CursorPattern(0);
+
+		for (i = 0; i < cursor->image.height; i++) {
+			int j = (cursor->image.width + 7) >> 3;
+			int k = 8 - j;
+
+			for (; j > 0; j--) {
+				u8 data = *bitmap ^ *mask;
+
+				if (cursor->rop == ROP_COPY)
+					data = *mask & *bitmap;
+				/* Upper 4 bits of bitmap data */
+				PM3_WRITE_DAC_REG(par, pos++,
+					cursor_bits_lookup[data >> 4] |
+					(cursor_bits_lookup[*mask >> 4] << 1));
+				/* Lower 4 bits of bitmap */
+				PM3_WRITE_DAC_REG(par, pos++,
+					cursor_bits_lookup[data & 0xf] |
+					(cursor_bits_lookup[*mask & 0xf] << 1));
+				bitmap++;
+				mask++;
+			}
+			for (; k > 0; k--) {
+				PM3_WRITE_DAC_REG(par, pos++, 0);
+				PM3_WRITE_DAC_REG(par, pos++, 0);
+			}
+		}
+		while (pos < PM3RD_CursorPattern(1024))
+			PM3_WRITE_DAC_REG(par, pos++, 0);
+	}
+	return 0;
+}
+
+/* write the mode to registers */
+static void pm3fb_write_mode(struct fb_info *info)
+{
+	struct pm3_par *par = info->par;
+	char tempsync = 0x00;
+	char tempmisc = 0x00;
+	const u32 hsstart = info->var.right_margin;
+	const u32 hsend = hsstart + info->var.hsync_len;
+	const u32 hbend = hsend + info->var.left_margin;
+	const u32 xres = (info->var.xres + 31) & ~31;
+	const u32 htotal = xres + hbend;
+	const u32 vsstart = info->var.lower_margin;
+	const u32 vsend = vsstart + info->var.vsync_len;
+	const u32 vbend = vsend + info->var.upper_margin;
+	const u32 vtotal = info->var.yres + vbend;
+	const u32 width = (info->var.xres_virtual + 7) & ~7;
+	const unsigned bpp = info->var.bits_per_pixel;
+
+	PM3_WAIT(par, 20);
+	PM3_WRITE_REG(par, PM3MemBypassWriteMask, 0xffffffff);
+	PM3_WRITE_REG(par, PM3Aperture0, 0x00000000);
+	PM3_WRITE_REG(par, PM3Aperture1, 0x00000000);
+	PM3_WRITE_REG(par, PM3FIFODis, 0x00000007);
+
+	PM3_WRITE_REG(par, PM3HTotal,
+			   pm3fb_shift_bpp(bpp, htotal - 1));
+	PM3_WRITE_REG(par, PM3HsEnd,
+			   pm3fb_shift_bpp(bpp, hsend));
+	PM3_WRITE_REG(par, PM3HsStart,
+			   pm3fb_shift_bpp(bpp, hsstart));
+	PM3_WRITE_REG(par, PM3HbEnd,
+			   pm3fb_shift_bpp(bpp, hbend));
+	PM3_WRITE_REG(par, PM3HgEnd,
+			   pm3fb_shift_bpp(bpp, hbend));
+	PM3_WRITE_REG(par, PM3ScreenStride,
+			   pm3fb_shift_bpp(bpp, width));
+	PM3_WRITE_REG(par, PM3VTotal, vtotal - 1);
+	PM3_WRITE_REG(par, PM3VsEnd, vsend - 1);
+	PM3_WRITE_REG(par, PM3VsStart, vsstart - 1);
+	PM3_WRITE_REG(par, PM3VbEnd, vbend);
+
+	switch (bpp) {
+	case 8:
+		PM3_WRITE_REG(par, PM3ByAperture1Mode,
+				   PM3ByApertureMode_PIXELSIZE_8BIT);
+		PM3_WRITE_REG(par, PM3ByAperture2Mode,
+				   PM3ByApertureMode_PIXELSIZE_8BIT);
+		break;
+
+	case 16:
+#ifndef __BIG_ENDIAN
+		PM3_WRITE_REG(par, PM3ByAperture1Mode,
+				   PM3ByApertureMode_PIXELSIZE_16BIT);
+		PM3_WRITE_REG(par, PM3ByAperture2Mode,
+				   PM3ByApertureMode_PIXELSIZE_16BIT);
+#else
+		PM3_WRITE_REG(par, PM3ByAperture1Mode,
+				   PM3ByApertureMode_PIXELSIZE_16BIT |
+				   PM3ByApertureMode_BYTESWAP_BADC);
+		PM3_WRITE_REG(par, PM3ByAperture2Mode,
+				   PM3ByApertureMode_PIXELSIZE_16BIT |
+				   PM3ByApertureMode_BYTESWAP_BADC);
+#endif /* ! __BIG_ENDIAN */
+		break;
+
+	case 32:
+#ifndef __BIG_ENDIAN
+		PM3_WRITE_REG(par, PM3ByAperture1Mode,
+				   PM3ByApertureMode_PIXELSIZE_32BIT);
+		PM3_WRITE_REG(par, PM3ByAperture2Mode,
+				   PM3ByApertureMode_PIXELSIZE_32BIT);
+#else
+		PM3_WRITE_REG(par, PM3ByAperture1Mode,
+				   PM3ByApertureMode_PIXELSIZE_32BIT |
+				   PM3ByApertureMode_BYTESWAP_DCBA);
+		PM3_WRITE_REG(par, PM3ByAperture2Mode,
+				   PM3ByApertureMode_PIXELSIZE_32BIT |
+				   PM3ByApertureMode_BYTESWAP_DCBA);
+#endif /* ! __BIG_ENDIAN */
+		break;
+
+	default:
+		DPRINTK("Unsupported depth %d\n", bpp);
+		break;
+	}
+
+	/*
+	 * Oxygen VX1 - it appears that setting PM3VideoControl and
+	 * then PM3RD_SyncControl to the same SYNC settings undoes
+	 * any net change - they seem to xor together.  Only set the
+	 * sync options in PM3RD_SyncControl.  --rmk
+	 */
+	{
+		unsigned int video = par->video;
+
+		video &= ~(PM3VideoControl_HSYNC_MASK |
+			   PM3VideoControl_VSYNC_MASK);
+		video |= PM3VideoControl_HSYNC_ACTIVE_HIGH |
+			 PM3VideoControl_VSYNC_ACTIVE_HIGH;
+		PM3_WRITE_REG(par, PM3VideoControl, video);
+	}
+	PM3_WRITE_REG(par, PM3VClkCtl,
+			   (PM3_READ_REG(par, PM3VClkCtl) & 0xFFFFFFFC));
+	PM3_WRITE_REG(par, PM3ScreenBase, par->base);
+	PM3_WRITE_REG(par, PM3ChipConfig,
+			   (PM3_READ_REG(par, PM3ChipConfig) & 0xFFFFFFFD));
+
+	wmb();
+	{
+		unsigned char m;	/* ClkPreScale */
+		unsigned char n;	/* ClkFeedBackScale */
+		unsigned char p;	/* ClkPostScale */
+		unsigned long pixclock = PICOS2KHZ(info->var.pixclock);
+
+		(void)pm3fb_calculate_clock(pixclock, &m, &n, &p);
+
+		DPRINTK("Pixclock: %ld, Pre: %d, Feedback: %d, Post: %d\n",
+			pixclock, (int) m, (int) n, (int) p);
+
+		PM3_WRITE_DAC_REG(par, PM3RD_DClk0PreScale, m);
+		PM3_WRITE_DAC_REG(par, PM3RD_DClk0FeedbackScale, n);
+		PM3_WRITE_DAC_REG(par, PM3RD_DClk0PostScale, p);
+	}
+	/*
+	   PM3_WRITE_DAC_REG(par, PM3RD_IndexControl, 0x00);
+	 */
+	/*
+	   PM3_SLOW_WRITE_REG(par, PM3RD_IndexControl, 0x00);
+	 */
+	if ((par->video & PM3VideoControl_HSYNC_MASK) ==
+	    PM3VideoControl_HSYNC_ACTIVE_HIGH)
+		tempsync |= PM3RD_SyncControl_HSYNC_ACTIVE_HIGH;
+	if ((par->video & PM3VideoControl_VSYNC_MASK) ==
+	    PM3VideoControl_VSYNC_ACTIVE_HIGH)
+		tempsync |= PM3RD_SyncControl_VSYNC_ACTIVE_HIGH;
+
+	PM3_WRITE_DAC_REG(par, PM3RD_SyncControl, tempsync);
+	DPRINTK("PM3RD_SyncControl: %d\n", tempsync);
+
+	PM3_WRITE_DAC_REG(par, PM3RD_DACControl, 0x00);
+
+	switch (pm3fb_depth(&info->var)) {
+	case 8:
+		PM3_WRITE_DAC_REG(par, PM3RD_PixelSize,
+				  PM3RD_PixelSize_8_BIT_PIXELS);
+		PM3_WRITE_DAC_REG(par, PM3RD_ColorFormat,
+				  PM3RD_ColorFormat_CI8_COLOR |
+				  PM3RD_ColorFormat_COLOR_ORDER_BLUE_LOW);
+		tempmisc |= PM3RD_MiscControl_HIGHCOLOR_RES_ENABLE;
+		break;
+	case 12:
+		PM3_WRITE_DAC_REG(par, PM3RD_PixelSize,
+				  PM3RD_PixelSize_16_BIT_PIXELS);
+		PM3_WRITE_DAC_REG(par, PM3RD_ColorFormat,
+				  PM3RD_ColorFormat_4444_COLOR |
+				  PM3RD_ColorFormat_COLOR_ORDER_BLUE_LOW |
+				  PM3RD_ColorFormat_LINEAR_COLOR_EXT_ENABLE);
+		tempmisc |= PM3RD_MiscControl_DIRECTCOLOR_ENABLE |
+			PM3RD_MiscControl_HIGHCOLOR_RES_ENABLE;
+		break;
+	case 15:
+		PM3_WRITE_DAC_REG(par, PM3RD_PixelSize,
+				  PM3RD_PixelSize_16_BIT_PIXELS);
+		PM3_WRITE_DAC_REG(par, PM3RD_ColorFormat,
+				  PM3RD_ColorFormat_5551_FRONT_COLOR |
+				  PM3RD_ColorFormat_COLOR_ORDER_BLUE_LOW |
+				  PM3RD_ColorFormat_LINEAR_COLOR_EXT_ENABLE);
+		tempmisc |= PM3RD_MiscControl_DIRECTCOLOR_ENABLE |
+			PM3RD_MiscControl_HIGHCOLOR_RES_ENABLE;
+		break;
+	case 16:
+		PM3_WRITE_DAC_REG(par, PM3RD_PixelSize,
+				  PM3RD_PixelSize_16_BIT_PIXELS);
+		PM3_WRITE_DAC_REG(par, PM3RD_ColorFormat,
+				  PM3RD_ColorFormat_565_FRONT_COLOR |
+				  PM3RD_ColorFormat_COLOR_ORDER_BLUE_LOW |
+				  PM3RD_ColorFormat_LINEAR_COLOR_EXT_ENABLE);
+		tempmisc |= PM3RD_MiscControl_DIRECTCOLOR_ENABLE |
+			PM3RD_MiscControl_HIGHCOLOR_RES_ENABLE;
+		break;
+	case 32:
+		PM3_WRITE_DAC_REG(par, PM3RD_PixelSize,
+				  PM3RD_PixelSize_32_BIT_PIXELS);
+		PM3_WRITE_DAC_REG(par, PM3RD_ColorFormat,
+				  PM3RD_ColorFormat_8888_COLOR |
+				  PM3RD_ColorFormat_COLOR_ORDER_BLUE_LOW);
+		tempmisc |= PM3RD_MiscControl_DIRECTCOLOR_ENABLE |
+			PM3RD_MiscControl_HIGHCOLOR_RES_ENABLE;
+		break;
+	}
+	PM3_WRITE_DAC_REG(par, PM3RD_MiscControl, tempmisc);
+}
+
+/*
+ * hardware independent functions
+ */
+static int pm3fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+	u32 lpitch;
+	unsigned bpp = var->red.length + var->green.length
+			+ var->blue.length + var->transp.length;
+
+	if (bpp != var->bits_per_pixel) {
+		/* set predefined mode for bits_per_pixel settings */
+
+		switch (var->bits_per_pixel) {
+		case 8:
+			var->red.length = 8;
+			var->green.length = 8;
+			var->blue.length = 8;
+			var->red.offset = 0;
+			var->green.offset = 0;
+			var->blue.offset = 0;
+			var->transp.offset = 0;
+			var->transp.length = 0;
+			break;
+		case 16:
+			var->red.length = 5;
+			var->blue.length = 5;
+			var->green.length = 6;
+			var->transp.length = 0;
+			break;
+		case 32:
+			var->red.length = 8;
+			var->green.length = 8;
+			var->blue.length = 8;
+			var->transp.length = 8;
+			break;
+		default:
+			DPRINTK("depth not supported: %u\n",
+				var->bits_per_pixel);
+			return -EINVAL;
+		}
+	}
+	/* it is assumed BGRA order */
+	if (var->bits_per_pixel > 8 ) {
+		var->blue.offset = 0;
+		var->green.offset = var->blue.length;
+		var->red.offset = var->green.offset + var->green.length;
+		var->transp.offset = var->red.offset + var->red.length;
+	}
+	var->height = -1;
+	var->width = -1;
+
+	if (var->xres != var->xres_virtual) {
+		DPRINTK("virtual x resolution != "
+			"physical x resolution not supported\n");
+		return -EINVAL;
+	}
+
+	if (var->yres > var->yres_virtual) {
+		DPRINTK("virtual y resolution < "
+			"physical y resolution not possible\n");
+		return -EINVAL;
+	}
+
+	if (var->xoffset) {
+		DPRINTK("xoffset not supported\n");
+		return -EINVAL;
+	}
+
+	if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED) {
+		DPRINTK("interlace not supported\n");
+		return -EINVAL;
+	}
+
+	var->xres = (var->xres + 31) & ~31; /* could sometimes be 8 */
+	lpitch = var->xres * ((var->bits_per_pixel + 7) >> 3);
+
+	if (var->xres < 200 || var->xres > 2048) {
+		DPRINTK("width not supported: %u\n", var->xres);
+		return -EINVAL;
+	}
+
+	if (var->yres < 200 || var->yres > 4095) {
+		DPRINTK("height not supported: %u\n", var->yres);
+		return -EINVAL;
+	}
+
+	if (lpitch * var->yres_virtual > info->fix.smem_len) {
+		DPRINTK("no memory for screen (%ux%ux%u)\n",
+			var->xres, var->yres_virtual, var->bits_per_pixel);
+		return -EINVAL;
+	}
+
+	if (PICOS2KHZ(var->pixclock) > PM3_MAX_PIXCLOCK) {
+		DPRINTK("pixclock too high (%ldKHz)\n",
+			PICOS2KHZ(var->pixclock));
+		return -EINVAL;
+	}
+
+	var->accel_flags = 0;	/* Can't mmap if this is on */
+
+	DPRINTK("Checking graphics mode at %dx%d depth %d\n",
+		var->xres, var->yres, var->bits_per_pixel);
+	return 0;
+}
+
+static int pm3fb_set_par(struct fb_info *info)
+{
+	struct pm3_par *par = info->par;
+	const u32 xres = (info->var.xres + 31) & ~31;
+	const unsigned bpp = info->var.bits_per_pixel;
+
+	par->base = pm3fb_shift_bpp(bpp, (info->var.yoffset * xres)
+					+ info->var.xoffset);
+	par->video = 0;
+
+	if (info->var.sync & FB_SYNC_HOR_HIGH_ACT)
+		par->video |= PM3VideoControl_HSYNC_ACTIVE_HIGH;
+	else
+		par->video |= PM3VideoControl_HSYNC_ACTIVE_LOW;
+
+	if (info->var.sync & FB_SYNC_VERT_HIGH_ACT)
+		par->video |= PM3VideoControl_VSYNC_ACTIVE_HIGH;
+	else
+		par->video |= PM3VideoControl_VSYNC_ACTIVE_LOW;
+
+	if ((info->var.vmode & FB_VMODE_MASK) == FB_VMODE_DOUBLE)
+		par->video |= PM3VideoControl_LINE_DOUBLE_ON;
+
+	if ((info->var.activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW)
+		par->video |= PM3VideoControl_ENABLE;
+	else
+		DPRINTK("PM3Video disabled\n");
+
+	switch (bpp) {
+	case 8:
+		par->video |= PM3VideoControl_PIXELSIZE_8BIT;
+		break;
+	case 16:
+		par->video |= PM3VideoControl_PIXELSIZE_16BIT;
+		break;
+	case 32:
+		par->video |= PM3VideoControl_PIXELSIZE_32BIT;
+		break;
+	default:
+		DPRINTK("Unsupported depth\n");
+		break;
+	}
+
+	info->fix.visual =
+		(bpp == 8) ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
+	info->fix.line_length = ((info->var.xres_virtual + 7)  >> 3) * bpp;
+
+/*	pm3fb_clear_memory(info, 0);*/
+	pm3fb_clear_colormap(par, 0, 0, 0);
+	PM3_WRITE_DAC_REG(par, PM3RD_CursorMode, 0);
+	pm3fb_init_engine(info);
+	pm3fb_write_mode(info);
+	return 0;
+}
+
+static int pm3fb_setcolreg(unsigned regno, unsigned red, unsigned green,
+			   unsigned blue, unsigned transp,
+			   struct fb_info *info)
+{
+	struct pm3_par *par = info->par;
+
+	if (regno >= 256)  /* no. of hw registers */
+	   return -EINVAL;
+
+	/* grayscale works only partially under directcolor */
+	/* grayscale = 0.30*R + 0.59*G + 0.11*B */
+	if (info->var.grayscale)
+	   red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
+
+	/* Directcolor:
+	 *   var->{color}.offset contains start of bitfield
+	 *   var->{color}.length contains length of bitfield
+	 *   {hardwarespecific} contains width of DAC
+	 *   pseudo_palette[X] is programmed to (X << red.offset) |
+	 *					(X << green.offset) |
+	 *					(X << blue.offset)
+	 *   RAMDAC[X] is programmed to (red, green, blue)
+	 *   color depth = SUM(var->{color}.length)
+	 *
+	 * Pseudocolor:
+	 *	var->{color}.offset is 0
+	 *	var->{color}.length contains width of DAC or the number
+	 *			of unique colors available (color depth)
+	 *	pseudo_palette is not used
+	 *	RAMDAC[X] is programmed to (red, green, blue)
+	 *	color depth = var->{color}.length
+	 */
+
+	/*
+	 * This is the point where the color is converted to something that
+	 * is acceptable by the hardware.
+	 */
+#define CNVT_TOHW(val, width) ((((val) << (width)) + 0x7FFF - (val)) >> 16)
+	red = CNVT_TOHW(red, info->var.red.length);
+	green = CNVT_TOHW(green, info->var.green.length);
+	blue = CNVT_TOHW(blue, info->var.blue.length);
+	transp = CNVT_TOHW(transp, info->var.transp.length);
+#undef CNVT_TOHW
+
+	if (info->fix.visual == FB_VISUAL_TRUECOLOR ||
+	info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
+		u32 v;
+
+		if (regno >= 16)
+			return -EINVAL;
+
+		v = (red << info->var.red.offset) |
+			(green << info->var.green.offset) |
+			(blue << info->var.blue.offset) |
+			(transp << info->var.transp.offset);
+
+		switch (info->var.bits_per_pixel) {
+		case 8:
+			break;
+		case 16:
+		case 32:
+			((u32 *)(info->pseudo_palette))[regno] = v;
+			break;
+		}
+		return 0;
+	} else if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR)
+		pm3fb_set_color(par, regno, red, green, blue);
+
+	return 0;
+}
+
+static int pm3fb_pan_display(struct fb_var_screeninfo *var,
+				 struct fb_info *info)
+{
+	struct pm3_par *par = info->par;
+	const u32 xres = (info->var.xres + 31) & ~31;
+
+	par->base = pm3fb_shift_bpp(info->var.bits_per_pixel,
+					(var->yoffset * xres)
+					+ var->xoffset);
+	PM3_WAIT(par, 1);
+	PM3_WRITE_REG(par, PM3ScreenBase, par->base);
+	return 0;
+}
+
+static int pm3fb_blank(int blank_mode, struct fb_info *info)
+{
+	struct pm3_par *par = info->par;
+	u32 video = par->video;
+
+	/*
+	 * Oxygen VX1 - it appears that setting PM3VideoControl and
+	 * then PM3RD_SyncControl to the same SYNC settings undoes
+	 * any net change - they seem to xor together.  Only set the
+	 * sync options in PM3RD_SyncControl.  --rmk
+	 */
+	video &= ~(PM3VideoControl_HSYNC_MASK |
+		   PM3VideoControl_VSYNC_MASK);
+	video |= PM3VideoControl_HSYNC_ACTIVE_HIGH |
+		 PM3VideoControl_VSYNC_ACTIVE_HIGH;
+
+	switch (blank_mode) {
+	case FB_BLANK_UNBLANK:
+		video |= PM3VideoControl_ENABLE;
+		break;
+	case FB_BLANK_NORMAL:
+		video &= ~PM3VideoControl_ENABLE;
+		break;
+	case FB_BLANK_HSYNC_SUSPEND:
+		video &= ~(PM3VideoControl_HSYNC_MASK |
+			  PM3VideoControl_BLANK_ACTIVE_LOW);
+		break;
+	case FB_BLANK_VSYNC_SUSPEND:
+		video &= ~(PM3VideoControl_VSYNC_MASK |
+			  PM3VideoControl_BLANK_ACTIVE_LOW);
+		break;
+	case FB_BLANK_POWERDOWN:
+		video &= ~(PM3VideoControl_HSYNC_MASK |
+			  PM3VideoControl_VSYNC_MASK |
+			  PM3VideoControl_BLANK_ACTIVE_LOW);
+		break;
+	default:
+		DPRINTK("Unsupported blanking %d\n", blank_mode);
+		return 1;
+	}
+
+	PM3_WAIT(par, 1);
+	PM3_WRITE_REG(par, PM3VideoControl, video);
+	return 0;
+}
+
+	/*
+	 *  Frame buffer operations
+	 */
+
+static const struct fb_ops pm3fb_ops = {
+	.owner		= THIS_MODULE,
+	__FB_DEFAULT_IOMEM_OPS_RDWR,
+	.fb_check_var	= pm3fb_check_var,
+	.fb_set_par	= pm3fb_set_par,
+	.fb_setcolreg	= pm3fb_setcolreg,
+	.fb_pan_display	= pm3fb_pan_display,
+	.fb_fillrect	= pm3fb_fillrect,
+	.fb_copyarea	= pm3fb_copyarea,
+	.fb_imageblit	= pm3fb_imageblit,
+	.fb_blank	= pm3fb_blank,
+	.fb_sync	= pm3fb_sync,
+	.fb_cursor	= pm3fb_cursor,
+	__FB_DEFAULT_IOMEM_OPS_MMAP,
+};
+
+/* ------------------------------------------------------------------------- */
+
+	/*
+	 *  Initialization
+	 */
+
+/* mmio register are already mapped when this function is called */
+/* the pm3fb_fix.smem_start is also set */
+static unsigned long pm3fb_size_memory(struct pm3_par *par)
+{
+	unsigned long	memsize = 0;
+	unsigned long	tempBypass, i, temp1, temp2;
+	unsigned char	__iomem *screen_mem;
+
+	pm3fb_fix.smem_len = 64 * 1024l * 1024; /* request full aperture size */
+	/* Linear frame buffer - request region and map it. */
+	if (!request_mem_region(pm3fb_fix.smem_start, pm3fb_fix.smem_len,
+				 "pm3fb smem")) {
+		printk(KERN_WARNING "pm3fb: Can't reserve smem.\n");
+		return 0;
+	}
+	screen_mem =
+		ioremap(pm3fb_fix.smem_start, pm3fb_fix.smem_len);
+	if (!screen_mem) {
+		printk(KERN_WARNING "pm3fb: Can't ioremap smem area.\n");
+		release_mem_region(pm3fb_fix.smem_start, pm3fb_fix.smem_len);
+		return 0;
+	}
+
+	/* TODO: card-specific stuff, *before* accessing *any* FB memory */
+	/* For Appian Jeronimo 2000 board second head */
+
+	tempBypass = PM3_READ_REG(par, PM3MemBypassWriteMask);
+
+	DPRINTK("PM3MemBypassWriteMask was: 0x%08lx\n", tempBypass);
+
+	PM3_WAIT(par, 1);
+	PM3_WRITE_REG(par, PM3MemBypassWriteMask, 0xFFFFFFFF);
+
+	/* pm3 split up memory, replicates, and do a lot of
+	 * nasty stuff IMHO ;-)
+	 */
+	for (i = 0; i < 32; i++) {
+		fb_writel(i * 0x00345678,
+			  (screen_mem + (i * 1048576)));
+		mb();
+		temp1 = fb_readl((screen_mem + (i * 1048576)));
+
+		/* Let's check for wrapover, write will fail at 16MB boundary */
+		if (temp1 == (i * 0x00345678))
+			memsize = i;
+		else
+			break;
+	}
+
+	DPRINTK("First detect pass already got %ld MB\n", memsize + 1);
+
+	if (memsize + 1 == i) {
+		for (i = 0; i < 32; i++) {
+			/* Clear first 32MB ; 0 is 0, no need to byteswap */
+			writel(0x0000000, (screen_mem + (i * 1048576)));
+		}
+		wmb();
+
+		for (i = 32; i < 64; i++) {
+			fb_writel(i * 0x00345678,
+				  (screen_mem + (i * 1048576)));
+			mb();
+			temp1 =
+			    fb_readl((screen_mem + (i * 1048576)));
+			temp2 =
+			    fb_readl((screen_mem + ((i - 32) * 1048576)));
+			/* different value, different RAM... */
+			if ((temp1 == (i * 0x00345678)) && (temp2 == 0))
+				memsize = i;
+			else
+				break;
+		}
+	}
+	DPRINTK("Second detect pass got %ld MB\n", memsize + 1);
+
+	PM3_WAIT(par, 1);
+	PM3_WRITE_REG(par, PM3MemBypassWriteMask, tempBypass);
+
+	iounmap(screen_mem);
+	release_mem_region(pm3fb_fix.smem_start, pm3fb_fix.smem_len);
+	memsize = 1048576 * (memsize + 1);
+
+	DPRINTK("Returning 0x%08lx bytes\n", memsize);
+
+	return memsize;
+}
+
+static int pm3fb_probe(struct pci_dev *dev, const struct pci_device_id *ent)
+{
+	struct fb_info *info;
+	struct pm3_par *par;
+	struct device *device = &dev->dev; /* for pci drivers */
+	int err;
+	int retval = -ENXIO;
+
+	err = aperture_remove_conflicting_pci_devices(dev, "pm3fb");
+	if (err)
+		return err;
+
+	err = pci_enable_device(dev);
+	if (err) {
+		printk(KERN_WARNING "pm3fb: Can't enable PCI dev: %d\n", err);
+		return err;
+	}
+	/*
+	 * Dynamically allocate info and par
+	 */
+	info = framebuffer_alloc(sizeof(struct pm3_par), device);
+
+	if (!info)
+		return -ENOMEM;
+	par = info->par;
+
+	/*
+	 * Here we set the screen_base to the virtual memory address
+	 * for the framebuffer.
+	 */
+	pm3fb_fix.mmio_start = pci_resource_start(dev, 0);
+	pm3fb_fix.mmio_len = PM3_REGS_SIZE;
+#if defined(__BIG_ENDIAN)
+	pm3fb_fix.mmio_start += PM3_REGS_SIZE;
+	DPRINTK("Adjusting register base for big-endian.\n");
+#endif
+
+	/* Registers - request region and map it. */
+	if (!request_mem_region(pm3fb_fix.mmio_start, pm3fb_fix.mmio_len,
+				 "pm3fb regbase")) {
+		printk(KERN_WARNING "pm3fb: Can't reserve regbase.\n");
+		goto err_exit_neither;
+	}
+	par->v_regs =
+		ioremap(pm3fb_fix.mmio_start, pm3fb_fix.mmio_len);
+	if (!par->v_regs) {
+		printk(KERN_WARNING "pm3fb: Can't remap %s register area.\n",
+			pm3fb_fix.id);
+		release_mem_region(pm3fb_fix.mmio_start, pm3fb_fix.mmio_len);
+		goto err_exit_neither;
+	}
+
+	/* Linear frame buffer - request region and map it. */
+	pm3fb_fix.smem_start = pci_resource_start(dev, 1);
+	pm3fb_fix.smem_len = pm3fb_size_memory(par);
+	if (!pm3fb_fix.smem_len) {
+		printk(KERN_WARNING "pm3fb: Can't find memory on board.\n");
+		goto err_exit_mmio;
+	}
+	if (!request_mem_region(pm3fb_fix.smem_start, pm3fb_fix.smem_len,
+				 "pm3fb smem")) {
+		printk(KERN_WARNING "pm3fb: Can't reserve smem.\n");
+		goto err_exit_mmio;
+	}
+	info->screen_base = ioremap_wc(pm3fb_fix.smem_start,
+				       pm3fb_fix.smem_len);
+	if (!info->screen_base) {
+		printk(KERN_WARNING "pm3fb: Can't ioremap smem area.\n");
+		release_mem_region(pm3fb_fix.smem_start, pm3fb_fix.smem_len);
+		goto err_exit_mmio;
+	}
+	info->screen_size = pm3fb_fix.smem_len;
+
+	if (!nomtrr)
+		par->wc_cookie = arch_phys_wc_add(pm3fb_fix.smem_start,
+						  pm3fb_fix.smem_len);
+	info->fbops = &pm3fb_ops;
+
+	par->video = PM3_READ_REG(par, PM3VideoControl);
+
+	info->fix = pm3fb_fix;
+	info->pseudo_palette = par->palette;
+	info->flags = FBINFO_HWACCEL_XPAN |
+			FBINFO_HWACCEL_YPAN |
+			FBINFO_HWACCEL_COPYAREA |
+			FBINFO_HWACCEL_IMAGEBLIT |
+			FBINFO_HWACCEL_FILLRECT;
+
+	if (noaccel) {
+		printk(KERN_DEBUG "disabling acceleration\n");
+		info->flags |= FBINFO_HWACCEL_DISABLED;
+	}
+	info->pixmap.addr = kmalloc(PM3_PIXMAP_SIZE, GFP_KERNEL);
+	if (!info->pixmap.addr) {
+		retval = -ENOMEM;
+		goto err_exit_pixmap;
+	}
+	info->pixmap.size = PM3_PIXMAP_SIZE;
+	info->pixmap.buf_align = 4;
+	info->pixmap.scan_align = 4;
+	info->pixmap.access_align = 32;
+	info->pixmap.flags = FB_PIXMAP_SYSTEM;
+
+	/*
+	 * This should give a reasonable default video mode. The following is
+	 * done when we can set a video mode.
+	 */
+	if (!mode_option)
+		mode_option = "640x480@60";
+
+	retval = fb_find_mode(&info->var, info, mode_option, NULL, 0, NULL, 8);
+
+	if (!retval || retval == 4) {
+		retval = -EINVAL;
+		goto err_exit_both;
+	}
+
+	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
+		retval = -ENOMEM;
+		goto err_exit_both;
+	}
+
+	/*
+	 * For drivers that can...
+	 */
+	pm3fb_check_var(&info->var, info);
+
+	if (register_framebuffer(info) < 0) {
+		retval = -EINVAL;
+		goto err_exit_all;
+	}
+	fb_info(info, "%s frame buffer device\n", info->fix.id);
+	pci_set_drvdata(dev, info);
+	return 0;
+
+ err_exit_all:
+	fb_dealloc_cmap(&info->cmap);
+ err_exit_both:
+	kfree(info->pixmap.addr);
+ err_exit_pixmap:
+	iounmap(info->screen_base);
+	release_mem_region(pm3fb_fix.smem_start, pm3fb_fix.smem_len);
+ err_exit_mmio:
+	iounmap(par->v_regs);
+	release_mem_region(pm3fb_fix.mmio_start, pm3fb_fix.mmio_len);
+ err_exit_neither:
+	framebuffer_release(info);
+	return retval;
+}
+
+	/*
+	 *  Cleanup
+	 */
+static void pm3fb_remove(struct pci_dev *dev)
+{
+	struct fb_info *info = pci_get_drvdata(dev);
+
+	if (info) {
+		struct fb_fix_screeninfo *fix = &info->fix;
+		struct pm3_par *par = info->par;
+
+		unregister_framebuffer(info);
+		fb_dealloc_cmap(&info->cmap);
+
+		arch_phys_wc_del(par->wc_cookie);
+		iounmap(info->screen_base);
+		release_mem_region(fix->smem_start, fix->smem_len);
+		iounmap(par->v_regs);
+		release_mem_region(fix->mmio_start, fix->mmio_len);
+
+		kfree(info->pixmap.addr);
+		framebuffer_release(info);
+	}
+}
+
+static const struct pci_device_id pm3fb_id_table[] = {
+	{ PCI_VDEVICE(3DLABS, 0x000a) },
+	{ }
+};
+
+/* For PCI drivers */
+static struct pci_driver pm3fb_driver = {
+	.name =		"pm3fb",
+	.id_table =	pm3fb_id_table,
+	.probe =	pm3fb_probe,
+	.remove =	pm3fb_remove,
+};
+
+MODULE_DEVICE_TABLE(pci, pm3fb_id_table);
+
+#ifndef MODULE
+	/*
+	 *  Setup
+	 */
+
+/*
+ * Only necessary if your driver takes special options,
+ * otherwise we fall back on the generic fb_setup().
+ */
+static int __init pm3fb_setup(char *options)
+{
+	char *this_opt;
+
+	/* Parse user specified options (`video=pm3fb:') */
+	if (!options || !*options)
+		return 0;
+
+	while ((this_opt = strsep(&options, ",")) != NULL) {
+		if (!*this_opt)
+			continue;
+		else if (!strncmp(this_opt, "noaccel", 7))
+			noaccel = 1;
+		else if (!strncmp(this_opt, "hwcursor=", 9))
+			hwcursor = simple_strtoul(this_opt + 9, NULL, 0);
+		else if (!strncmp(this_opt, "nomtrr", 6))
+			nomtrr = 1;
+		else
+			mode_option = this_opt;
+	}
+	return 0;
+}
+#endif /* MODULE */
+
+static int __init pm3fb_init(void)
+{
+	/*
+	 *  For kernel boot options (in 'video=pm3fb:<options>' format)
+	 */
+#ifndef MODULE
+	char *option = NULL;
+#endif
+
+	if (fb_modesetting_disabled("pm3fb"))
+		return -ENODEV;
+
+#ifndef MODULE
+	if (fb_get_options("pm3fb", &option))
+		return -ENODEV;
+	pm3fb_setup(option);
+#endif
+
+	return pci_register_driver(&pm3fb_driver);
+}
+
+#ifdef MODULE
+static void __exit pm3fb_exit(void)
+{
+	pci_unregister_driver(&pm3fb_driver);
+}
+
+module_exit(pm3fb_exit);
+#endif
+module_init(pm3fb_init);
+
+module_param(mode_option, charp, 0);
+MODULE_PARM_DESC(mode_option, "Initial video mode e.g. '648x480-8@60'");
+module_param(noaccel, bool, 0);
+MODULE_PARM_DESC(noaccel, "Disable acceleration");
+module_param(hwcursor, int, 0644);
+MODULE_PARM_DESC(hwcursor, "Enable hardware cursor "
+			"(1=enable, 0=disable, default=1)");
+module_param(nomtrr, bool, 0);
+MODULE_PARM_DESC(nomtrr, "Disable MTRR support (0 or 1=disabled) (default=0)");
+
+MODULE_DESCRIPTION("Permedia3 framebuffer device driver");
+MODULE_LICENSE("GPL");
-- 
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