From a9e3760b0838299649c0d57cca44daaf40ba3c33 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Mon, 14 Sep 2026 22:12:34 -1000
Subject: sched_ext: Maintain an online cid mask in the scheduler arena

Schedulers on the default cid mapping treat [0, nr_online_cids) as the
online set and restart on hotplug. Schedulers that install their own mapping
with scx_bpf_cid_override() have no way to learn which cids are online: the
count no longer identifies members and the CPU-form cpumask is unusable from
cid programs. This is an obvious hole in the cid API.

Add scx_bpf_online_cmask(), a kernel-maintained cmask in the scheduler's
arena, allocated alongside the per-CPU scratch masks and populated after the
cid mapping is finalized and before ops.init(), for child schedulers too.
The pointer stays valid through ops.exit() with no reference to take. It is
the arena offset as a void pointer, the same form struct_ops arena arguments
arrive in. The verifier types the void return as a scalar for the program's
arena cast.

The mask follows the SCX hotplug notifications: seeded from cpu_active_mask
and updated before ops.cid_online/offline() runs, so it lags cpu_online_mask
only inside a hotplug transition. Updates walk the scheduler list under the
lock that also serializes unlinking. Reads are live, not atomic snapshots.
Root initialization excludes hotplug.

v2: Reworded the getter kerneldoc (Andrea Righi).

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
---
 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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