Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3791 insertions, 0 deletions

diff --git a/drivers/video/fbdev/amifb.c b/drivers/video/fbdev/amifb.c
new file mode 100644
index 000000000..226682550
--- /dev/null
+++ b/drivers/video/fbdev/amifb.c
@@ -0,0 +1,3791 @@
+/*
+ * linux/drivers/video/amifb.c -- Amiga builtin chipset frame buffer device
+ *
+ *    Copyright (C) 1995-2003 Geert Uytterhoeven
+ *
+ *          with work by Roman Zippel
+ *
+ *
+ * This file is based on the Atari frame buffer device (atafb.c):
+ *
+ *    Copyright (C) 1994 Martin Schaller
+ *                       Roman Hodek
+ *
+ *          with work by Andreas Schwab
+ *                       Guenther Kelleter
+ *
+ * and on the original Amiga console driver (amicon.c):
+ *
+ *    Copyright (C) 1993 Hamish Macdonald
+ *                       Greg Harp
+ *    Copyright (C) 1994 David Carter [carter@compsci.bristol.ac.uk]
+ *
+ *          with work by William Rucklidge (wjr@cs.cornell.edu)
+ *                       Geert Uytterhoeven
+ *                       Jes Sorensen (jds@kom.auc.dk)
+ *
+ *
+ * History:
+ *
+ *   - 24 Jul 96: Copper generates now vblank interrupt and
+ *                VESA Power Saving Protocol is fully implemented
+ *   - 14 Jul 96: Rework and hopefully last ECS bugs fixed
+ *   -  7 Mar 96: Hardware sprite support by Roman Zippel
+ *   - 18 Feb 96: OCS and ECS support by Roman Zippel
+ *                Hardware functions completely rewritten
+ *   -  2 Dec 95: AGA version by Geert Uytterhoeven
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+
+#include <asm/irq.h>
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+#include <asm/setup.h>
+
+#include "c2p.h"
+
+
+#define DEBUG
+
+#if !defined(CONFIG_FB_AMIGA_OCS) && !defined(CONFIG_FB_AMIGA_ECS) && !defined(CONFIG_FB_AMIGA_AGA)
+#define CONFIG_FB_AMIGA_OCS   /* define at least one fb driver, this will change later */
+#endif
+
+#if !defined(CONFIG_FB_AMIGA_OCS)
+#  define IS_OCS (0)
+#elif defined(CONFIG_FB_AMIGA_ECS) || defined(CONFIG_FB_AMIGA_AGA)
+#  define IS_OCS (chipset == TAG_OCS)
+#else
+#  define CONFIG_FB_AMIGA_OCS_ONLY
+#  define IS_OCS (1)
+#endif
+
+#if !defined(CONFIG_FB_AMIGA_ECS)
+#  define IS_ECS (0)
+#elif defined(CONFIG_FB_AMIGA_OCS) || defined(CONFIG_FB_AMIGA_AGA)
+#  define IS_ECS (chipset == TAG_ECS)
+#else
+#  define CONFIG_FB_AMIGA_ECS_ONLY
+#  define IS_ECS (1)
+#endif
+
+#if !defined(CONFIG_FB_AMIGA_AGA)
+#  define IS_AGA (0)
+#elif defined(CONFIG_FB_AMIGA_OCS) || defined(CONFIG_FB_AMIGA_ECS)
+#  define IS_AGA (chipset == TAG_AGA)
+#else
+#  define CONFIG_FB_AMIGA_AGA_ONLY
+#  define IS_AGA (1)
+#endif
+
+#ifdef DEBUG
+#  define DPRINTK(fmt, args...)	printk(KERN_DEBUG "%s: " fmt, __func__ , ## args)
+#else
+#  define DPRINTK(fmt, args...)
+#endif
+
+/*******************************************************************************
+
+
+   Generic video timings
+   ---------------------
+
+   Timings used by the frame buffer interface:
+
+   +----------+---------------------------------------------+----------+-------+
+   |          |                ^                            |          |       |
+   |          |                |upper_margin                |          |       |
+   |          |                v                            |          |       |
+   +----------###############################################----------+-------+
+   |          #                ^                            #          |       |
+   |          #                |                            #          |       |
+   |          #                |                            #          |       |
+   |          #                |                            #          |       |
+   |   left   #                |                            #  right   | hsync |
+   |  margin  #                |       xres                 #  margin  |  len  |
+   |<-------->#<---------------+--------------------------->#<-------->|<----->|
+   |          #                |                            #          |       |
+   |          #                |                            #          |       |
+   |          #                |                            #          |       |
+   |          #                |yres                        #          |       |
+   |          #                |                            #          |       |
+   |          #                |                            #          |       |
+   |          #                |                            #          |       |
+   |          #                |                            #          |       |
+   |          #                |                            #          |       |
+   |          #                |                            #          |       |
+   |          #                |                            #          |       |
+   |          #                |                            #          |       |
+   |          #                v                            #          |       |
+   +----------###############################################----------+-------+
+   |          |                ^                            |          |       |
+   |          |                |lower_margin                |          |       |
+   |          |                v                            |          |       |
+   +----------+---------------------------------------------+----------+-------+
+   |          |                ^                            |          |       |
+   |          |                |vsync_len                   |          |       |
+   |          |                v                            |          |       |
+   +----------+---------------------------------------------+----------+-------+
+
+
+   Amiga video timings
+   -------------------
+
+   The Amiga native chipsets uses another timing scheme:
+
+      - hsstrt:   Start of horizontal synchronization pulse
+      - hsstop:   End of horizontal synchronization pulse
+      - htotal:   Last value on the line (i.e. line length = htotal + 1)
+      - vsstrt:   Start of vertical synchronization pulse
+      - vsstop:   End of vertical synchronization pulse
+      - vtotal:   Last line value (i.e. number of lines = vtotal + 1)
+      - hcenter:  Start of vertical retrace for interlace
+
+   You can specify the blanking timings independently. Currently I just set
+   them equal to the respective synchronization values:
+
+      - hbstrt:   Start of horizontal blank
+      - hbstop:   End of horizontal blank
+      - vbstrt:   Start of vertical blank
+      - vbstop:   End of vertical blank
+
+   Horizontal values are in color clock cycles (280 ns), vertical values are in
+   scanlines.
+
+   (0, 0) is somewhere in the upper-left corner :-)
+
+
+   Amiga visible window definitions
+   --------------------------------
+
+   Currently I only have values for AGA, SHRES (28 MHz dotclock). Feel free to
+   make corrections and/or additions.
+
+   Within the above synchronization specifications, the visible window is
+   defined by the following parameters (actual register resolutions may be
+   different; all horizontal values are normalized with respect to the pixel
+   clock):
+
+      - diwstrt_h:   Horizontal start of the visible window
+      - diwstop_h:   Horizontal stop + 1(*) of the visible window
+      - diwstrt_v:   Vertical start of the visible window
+      - diwstop_v:   Vertical stop of the visible window
+      - ddfstrt:     Horizontal start of display DMA
+      - ddfstop:     Horizontal stop of display DMA
+      - hscroll:     Horizontal display output delay
+
+   Sprite positioning:
+
+      - sprstrt_h:   Horizontal start - 4 of sprite
+      - sprstrt_v:   Vertical start of sprite
+
+   (*) Even Commodore did it wrong in the AGA monitor drivers by not adding 1.
+
+   Horizontal values are in dotclock cycles (35 ns), vertical values are in
+   scanlines.
+
+   (0, 0) is somewhere in the upper-left corner :-)
+
+
+   Dependencies (AGA, SHRES (35 ns dotclock))
+   -------------------------------------------
+
+   Since there are much more parameters for the Amiga display than for the
+   frame buffer interface, there must be some dependencies among the Amiga
+   display parameters. Here's what I found out:
+
+      - ddfstrt and ddfstop are best aligned to 64 pixels.
+      - the chipset needs 64 + 4 horizontal pixels after the DMA start before
+	the first pixel is output, so diwstrt_h = ddfstrt + 64 + 4 if you want
+	to display the first pixel on the line too. Increase diwstrt_h for
+	virtual screen panning.
+      - the display DMA always fetches 64 pixels at a time (fmode = 3).
+      - ddfstop is ddfstrt+#pixels - 64.
+      - diwstop_h = diwstrt_h + xres + 1. Because of the additional 1 this can
+	be 1 more than htotal.
+      - hscroll simply adds a delay to the display output. Smooth horizontal
+	panning needs an extra 64 pixels on the left to prefetch the pixels that
+	`fall off' on the left.
+      - if ddfstrt < 192, the sprite DMA cycles are all stolen by the bitplane
+	DMA, so it's best to make the DMA start as late as possible.
+      - you really don't want to make ddfstrt < 128, since this will steal DMA
+	cycles from the other DMA channels (audio, floppy and Chip RAM refresh).
+      - I make diwstop_h and diwstop_v as large as possible.
+
+   General dependencies
+   --------------------
+
+      - all values are SHRES pixel (35ns)
+
+		  table 1:fetchstart  table 2:prefetch    table 3:fetchsize
+		  ------------------  ----------------    -----------------
+   Pixclock     # SHRES|HIRES|LORES # SHRES|HIRES|LORES # SHRES|HIRES|LORES
+   -------------#------+-----+------#------+-----+------#------+-----+------
+   Bus width 1x #   16 |  32 |  64  #   16 |  32 |  64  #   64 |  64 |  64
+   Bus width 2x #   32 |  64 | 128  #   32 |  64 |  64  #   64 |  64 | 128
+   Bus width 4x #   64 | 128 | 256  #   64 |  64 |  64  #   64 | 128 | 256
+
+      - chipset needs 4 pixels before the first pixel is output
+      - ddfstrt must be aligned to fetchstart (table 1)
+      - chipset needs also prefetch (table 2) to get first pixel data, so
+	ddfstrt = ((diwstrt_h - 4) & -fetchstart) - prefetch
+      - for horizontal panning decrease diwstrt_h
+      - the length of a fetchline must be aligned to fetchsize (table 3)
+      - if fetchstart is smaller than fetchsize, then ddfstrt can a little bit
+	moved to optimize use of dma (useful for OCS/ECS overscan displays)
+      - ddfstop is ddfstrt + ddfsize - fetchsize
+      - If C= didn't change anything for AGA, then at following positions the
+	dma bus is already used:
+	ddfstrt <  48 -> memory refresh
+		<  96 -> disk dma
+		< 160 -> audio dma
+		< 192 -> sprite 0 dma
+		< 416 -> sprite dma (32 per sprite)
+      - in accordance with the hardware reference manual a hardware stop is at
+	192, but AGA (ECS?) can go below this.
+
+   DMA priorities
+   --------------
+
+   Since there are limits on the earliest start value for display DMA and the
+   display of sprites, I use the following policy on horizontal panning and
+   the hardware cursor:
+
+      - if you want to start display DMA too early, you lose the ability to
+	do smooth horizontal panning (xpanstep 1 -> 64).
+      - if you want to go even further, you lose the hardware cursor too.
+
+   IMHO a hardware cursor is more important for X than horizontal scrolling,
+   so that's my motivation.
+
+
+   Implementation
+   --------------
+
+   ami_decode_var() converts the frame buffer values to the Amiga values. It's
+   just a `straightforward' implementation of the above rules.
+
+
+   Standard VGA timings
+   --------------------
+
+	       xres  yres    left  right  upper  lower    hsync    vsync
+	       ----  ----    ----  -----  -----  -----    -----    -----
+      80x25     720   400      27     45     35     12      108        2
+      80x30     720   480      27     45     30      9      108        2
+
+   These were taken from a XFree86 configuration file, recalculated for a 28 MHz
+   dotclock (Amigas don't have a 25 MHz dotclock) and converted to frame buffer
+   generic timings.
+
+   As a comparison, graphics/monitor.h suggests the following:
+
+	       xres  yres    left  right  upper  lower    hsync    vsync
+	       ----  ----    ----  -----  -----  -----    -----    -----
+
+      VGA       640   480      52    112     24     19    112 -      2 +
+      VGA70     640   400      52    112     27     21    112 -      2 -
+
+
+   Sync polarities
+   ---------------
+
+      VSYNC    HSYNC    Vertical size    Vertical total
+      -----    -----    -------------    --------------
+	+        +           Reserved          Reserved
+	+        -                400               414
+	-        +                350               362
+	-        -                480               496
+
+   Source: CL-GD542X Technical Reference Manual, Cirrus Logic, Oct 1992
+
+
+   Broadcast video timings
+   -----------------------
+
+   According to the CCIR and RETMA specifications, we have the following values:
+
+   CCIR -> PAL
+   -----------
+
+      - a scanline is 64 µs long, of which 52.48 µs are visible. This is about
+	736 visible 70 ns pixels per line.
+      - we have 625 scanlines, of which 575 are visible (interlaced); after
+	rounding this becomes 576.
+
+   RETMA -> NTSC
+   -------------
+
+      - a scanline is 63.5 µs long, of which 53.5 µs are visible.  This is about
+	736 visible 70 ns pixels per line.
+      - we have 525 scanlines, of which 485 are visible (interlaced); after
+	rounding this becomes 484.
+
+   Thus if you want a PAL compatible display, you have to do the following:
+
+      - set the FB_SYNC_BROADCAST flag to indicate that standard broadcast
+	timings are to be used.
+      - make sure upper_margin + yres + lower_margin + vsync_len = 625 for an
+	interlaced, 312 for a non-interlaced and 156 for a doublescanned
+	display.
+      - make sure left_margin + xres + right_margin + hsync_len = 1816 for a
+	SHRES, 908 for a HIRES and 454 for a LORES display.
+      - the left visible part begins at 360 (SHRES; HIRES:180, LORES:90),
+	left_margin + 2 * hsync_len must be greater or equal.
+      - the upper visible part begins at 48 (interlaced; non-interlaced:24,
+	doublescanned:12), upper_margin + 2 * vsync_len must be greater or
+	equal.
+      - ami_encode_var() calculates margins with a hsync of 5320 ns and a vsync
+	of 4 scanlines
+
+   The settings for a NTSC compatible display are straightforward.
+
+   Note that in a strict sense the PAL and NTSC standards only define the
+   encoding of the color part (chrominance) of the video signal and don't say
+   anything about horizontal/vertical synchronization nor refresh rates.
+
+
+							    -- Geert --
+
+*******************************************************************************/
+
+
+	/*
+	 * Custom Chipset Definitions
+	 */
+
+#define CUSTOM_OFS(fld) ((long)&((struct CUSTOM*)0)->fld)
+
+	/*
+	 * BPLCON0 -- Bitplane Control Register 0
+	 */
+
+#define BPC0_HIRES	(0x8000)
+#define BPC0_BPU2	(0x4000) /* Bit plane used count */
+#define BPC0_BPU1	(0x2000)
+#define BPC0_BPU0	(0x1000)
+#define BPC0_HAM	(0x0800) /* HAM mode */
+#define BPC0_DPF	(0x0400) /* Double playfield */
+#define BPC0_COLOR	(0x0200) /* Enable colorburst */
+#define BPC0_GAUD	(0x0100) /* Genlock audio enable */
+#define BPC0_UHRES	(0x0080) /* Ultrahi res enable */
+#define BPC0_SHRES	(0x0040) /* Super hi res mode */
+#define BPC0_BYPASS	(0x0020) /* Bypass LUT - AGA */
+#define BPC0_BPU3	(0x0010) /* AGA */
+#define BPC0_LPEN	(0x0008) /* Light pen enable */
+#define BPC0_LACE	(0x0004) /* Interlace */
+#define BPC0_ERSY	(0x0002) /* External resync */
+#define BPC0_ECSENA	(0x0001) /* ECS enable */
+
+	/*
+	 * BPLCON2 -- Bitplane Control Register 2
+	 */
+
+#define BPC2_ZDBPSEL2	(0x4000) /* Bitplane to be used for ZD - AGA */
+#define BPC2_ZDBPSEL1	(0x2000)
+#define BPC2_ZDBPSEL0	(0x1000)
+#define BPC2_ZDBPEN	(0x0800) /* Enable ZD with ZDBPSELx - AGA */
+#define BPC2_ZDCTEN	(0x0400) /* Enable ZD with palette bit #31 - AGA */
+#define BPC2_KILLEHB	(0x0200) /* Kill EHB mode - AGA */
+#define BPC2_RDRAM	(0x0100) /* Color table accesses read, not write - AGA */
+#define BPC2_SOGEN	(0x0080) /* SOG output pin high - AGA */
+#define BPC2_PF2PRI	(0x0040) /* PF2 priority over PF1 */
+#define BPC2_PF2P2	(0x0020) /* PF2 priority wrt sprites */
+#define BPC2_PF2P1	(0x0010)
+#define BPC2_PF2P0	(0x0008)
+#define BPC2_PF1P2	(0x0004) /* ditto PF1 */
+#define BPC2_PF1P1	(0x0002)
+#define BPC2_PF1P0	(0x0001)
+
+	/*
+	 * BPLCON3 -- Bitplane Control Register 3 (AGA)
+	 */
+
+#define BPC3_BANK2	(0x8000) /* Bits to select color register bank */
+#define BPC3_BANK1	(0x4000)
+#define BPC3_BANK0	(0x2000)
+#define BPC3_PF2OF2	(0x1000) /* Bits for color table offset when PF2 */
+#define BPC3_PF2OF1	(0x0800)
+#define BPC3_PF2OF0	(0x0400)
+#define BPC3_LOCT	(0x0200) /* Color register writes go to low bits */
+#define BPC3_SPRES1	(0x0080) /* Sprite resolution bits */
+#define BPC3_SPRES0	(0x0040)
+#define BPC3_BRDRBLNK	(0x0020) /* Border blanked? */
+#define BPC3_BRDRTRAN	(0x0010) /* Border transparent? */
+#define BPC3_ZDCLKEN	(0x0004) /* ZD pin is 14 MHz (HIRES) clock output */
+#define BPC3_BRDRSPRT	(0x0002) /* Sprites in border? */
+#define BPC3_EXTBLKEN	(0x0001) /* BLANK programmable */
+
+	/*
+	 * BPLCON4 -- Bitplane Control Register 4 (AGA)
+	 */
+
+#define BPC4_BPLAM7	(0x8000) /* bitplane color XOR field */
+#define BPC4_BPLAM6	(0x4000)
+#define BPC4_BPLAM5	(0x2000)
+#define BPC4_BPLAM4	(0x1000)
+#define BPC4_BPLAM3	(0x0800)
+#define BPC4_BPLAM2	(0x0400)
+#define BPC4_BPLAM1	(0x0200)
+#define BPC4_BPLAM0	(0x0100)
+#define BPC4_ESPRM7	(0x0080) /* 4 high bits for even sprite colors */
+#define BPC4_ESPRM6	(0x0040)
+#define BPC4_ESPRM5	(0x0020)
+#define BPC4_ESPRM4	(0x0010)
+#define BPC4_OSPRM7	(0x0008) /* 4 high bits for odd sprite colors */
+#define BPC4_OSPRM6	(0x0004)
+#define BPC4_OSPRM5	(0x0002)
+#define BPC4_OSPRM4	(0x0001)
+
+	/*
+	 * BEAMCON0 -- Beam Control Register
+	 */
+
+#define BMC0_HARDDIS	(0x4000) /* Disable hardware limits */
+#define BMC0_LPENDIS	(0x2000) /* Disable light pen latch */
+#define BMC0_VARVBEN	(0x1000) /* Enable variable vertical blank */
+#define BMC0_LOLDIS	(0x0800) /* Disable long/short line toggle */
+#define BMC0_CSCBEN	(0x0400) /* Composite sync/blank */
+#define BMC0_VARVSYEN	(0x0200) /* Enable variable vertical sync */
+#define BMC0_VARHSYEN	(0x0100) /* Enable variable horizontal sync */
+#define BMC0_VARBEAMEN	(0x0080) /* Enable variable beam counters */
+#define BMC0_DUAL	(0x0040) /* Enable alternate horizontal beam counter */
+#define BMC0_PAL	(0x0020) /* Set decodes for PAL */
+#define BMC0_VARCSYEN	(0x0010) /* Enable variable composite sync */
+#define BMC0_BLANKEN	(0x0008) /* Blank enable (no longer used on AGA) */
+#define BMC0_CSYTRUE	(0x0004) /* CSY polarity */
+#define BMC0_VSYTRUE	(0x0002) /* VSY polarity */
+#define BMC0_HSYTRUE	(0x0001) /* HSY polarity */
+
+
+	/*
+	 * FMODE -- Fetch Mode Control Register (AGA)
+	 */
+
+#define FMODE_SSCAN2	(0x8000) /* Sprite scan-doubling */
+#define FMODE_BSCAN2	(0x4000) /* Use PF2 modulus every other line */
+#define FMODE_SPAGEM	(0x0008) /* Sprite page mode */
+#define FMODE_SPR32	(0x0004) /* Sprite 32 bit fetch */
+#define FMODE_BPAGEM	(0x0002) /* Bitplane page mode */
+#define FMODE_BPL32	(0x0001) /* Bitplane 32 bit fetch */
+
+	/*
+	 * Tags used to indicate a specific Pixel Clock
+	 *
+	 * clk_shift is the shift value to get the timings in 35 ns units
+	 */
+
+enum { TAG_SHRES, TAG_HIRES, TAG_LORES };
+
+	/*
+	 * Tags used to indicate the specific chipset
+	 */
+
+enum { TAG_OCS, TAG_ECS, TAG_AGA };
+
+	/*
+	 * Tags used to indicate the memory bandwidth
+	 */
+
+enum { TAG_FMODE_1, TAG_FMODE_2, TAG_FMODE_4 };
+
+
+	/*
+	 * Clock Definitions, Maximum Display Depth
+	 *
+	 * These depend on the E-Clock or the Chipset, so they are filled in
+	 * dynamically
+	 */
+
+static u_long pixclock[3];	/* SHRES/HIRES/LORES: index = clk_shift */
+static u_short maxdepth[3];	/* SHRES/HIRES/LORES: index = clk_shift */
+static u_short maxfmode, chipset;
+
+
+	/*
+	 * Broadcast Video Timings
+	 *
+	 * Horizontal values are in 35 ns (SHRES) units
+	 * Vertical values are in interlaced scanlines
+	 */
+
+#define PAL_DIWSTRT_H	(360)	/* PAL Window Limits */
+#define PAL_DIWSTRT_V	(48)
+#define PAL_HTOTAL	(1816)
+#define PAL_VTOTAL	(625)
+
+#define NTSC_DIWSTRT_H	(360)	/* NTSC Window Limits */
+#define NTSC_DIWSTRT_V	(40)
+#define NTSC_HTOTAL	(1816)
+#define NTSC_VTOTAL	(525)
+
+
+	/*
+	 * Various macros
+	 */
+
+#define up2(v)		(((v) + 1) & -2)
+#define down2(v)	((v) & -2)
+#define div2(v)		((v)>>1)
+#define mod2(v)		((v) & 1)
+
+#define up4(v)		(((v) + 3) & -4)
+#define down4(v)	((v) & -4)
+#define mul4(v)		((v) << 2)
+#define div4(v)		((v)>>2)
+#define mod4(v)		((v) & 3)
+
+#define up8(v)		(((v) + 7) & -8)
+#define down8(v)	((v) & -8)
+#define div8(v)		((v)>>3)
+#define mod8(v)		((v) & 7)
+
+#define up16(v)		(((v) + 15) & -16)
+#define down16(v)	((v) & -16)
+#define div16(v)	((v)>>4)
+#define mod16(v)	((v) & 15)
+
+#define up32(v)		(((v) + 31) & -32)
+#define down32(v)	((v) & -32)
+#define div32(v)	((v)>>5)
+#define mod32(v)	((v) & 31)
+
+#define up64(v)		(((v) + 63) & -64)
+#define down64(v)	((v) & -64)
+#define div64(v)	((v)>>6)
+#define mod64(v)	((v) & 63)
+
+#define upx(x, v)	(((v) + (x) - 1) & -(x))
+#define downx(x, v)	((v) & -(x))
+#define modx(x, v)	((v) & ((x) - 1))
+
+/*
+ * FIXME: Use C variants of the code marked with #ifdef __mc68000__
+ * in the driver. It shouldn't negatively affect the performance and
+ * is required for APUS support (once it is re-added to the kernel).
+ * Needs to be tested on the hardware though..
+ */
+/* if x1 is not a constant, this macro won't make real sense :-) */
+#ifdef __mc68000__
+#define DIVUL(x1, x2) ({int res; asm("divul %1,%2,%3": "=d" (res): \
+	"d" (x2), "d" ((long)((x1) / 0x100000000ULL)), "0" ((long)(x1))); res;})
+#else
+/* We know a bit about the numbers, so we can do it this way */
+#define DIVUL(x1, x2) ((((long)((unsigned long long)x1 >> 8) / x2) << 8) + \
+	((((long)((unsigned long long)x1 >> 8) % x2) << 8) / x2))
+#endif
+
+#define highw(x)	((u_long)(x)>>16 & 0xffff)
+#define loww(x)		((u_long)(x) & 0xffff)
+
+#define custom		amiga_custom
+
+#define VBlankOn()	custom.intena = IF_SETCLR|IF_COPER
+#define VBlankOff()	custom.intena = IF_COPER
+
+
+	/*
+	 * Chip RAM we reserve for the Frame Buffer
+	 *
+	 * This defines the Maximum Virtual Screen Size
+	 * (Setable per kernel options?)
+	 */
+
+#define VIDEOMEMSIZE_AGA_2M	(1310720) /* AGA (2MB) : max 1280*1024*256  */
+#define VIDEOMEMSIZE_AGA_1M	(786432)  /* AGA (1MB) : max 1024*768*256   */
+#define VIDEOMEMSIZE_ECS_2M	(655360)  /* ECS (2MB) : max 1280*1024*16   */
+#define VIDEOMEMSIZE_ECS_1M	(393216)  /* ECS (1MB) : max 1024*768*16    */
+#define VIDEOMEMSIZE_OCS	(262144)  /* OCS       : max ca. 800*600*16 */
+
+#define SPRITEMEMSIZE		(64 * 64 / 4) /* max 64*64*4 */
+#define DUMMYSPRITEMEMSIZE	(8)
+static u_long spritememory;
+
+#define CHIPRAM_SAFETY_LIMIT	(16384)
+
+static u_long videomemory;
+
+	/*
+	 * This is the earliest allowed start of fetching display data.
+	 * Only if you really want no hardware cursor and audio,
+	 * set this to 128, but let it better at 192
+	 */
+
+static u_long min_fstrt = 192;
+
+#define assignchunk(name, type, ptr, size) \
+{ \
+	(name) = (type)(ptr); \
+	ptr += size; \
+}
+
+
+	/*
+	 * Copper Instructions
+	 */
+
+#define CMOVE(val, reg)		(CUSTOM_OFS(reg) << 16 | (val))
+#define CMOVE2(val, reg)	((CUSTOM_OFS(reg) + 2) << 16 | (val))
+#define CWAIT(x, y)		(((y) & 0x1fe) << 23 | ((x) & 0x7f0) << 13 | 0x0001fffe)
+#define CEND			(0xfffffffe)
+
+
+typedef union {
+	u_long l;
+	u_short w[2];
+} copins;
+
+static struct copdisplay {
+	copins *init;
+	copins *wait;
+	copins *list[2][2];
+	copins *rebuild[2];
+} copdisplay;
+
+static u_short currentcop = 0;
+
+	/*
+	 * Hardware Cursor API Definitions
+	 * These used to be in linux/fb.h, but were preliminary and used by
+	 * amifb only anyway
+	 */
+
+#define FBIOGET_FCURSORINFO     0x4607
+#define FBIOGET_VCURSORINFO     0x4608
+#define FBIOPUT_VCURSORINFO     0x4609
+#define FBIOGET_CURSORSTATE     0x460A
+#define FBIOPUT_CURSORSTATE     0x460B
+
+
+struct fb_fix_cursorinfo {
+	__u16 crsr_width;		/* width and height of the cursor in */
+	__u16 crsr_height;		/* pixels (zero if no cursor)	*/
+	__u16 crsr_xsize;		/* cursor size in display pixels */
+	__u16 crsr_ysize;
+	__u16 crsr_color1;		/* colormap entry for cursor color1 */
+	__u16 crsr_color2;		/* colormap entry for cursor color2 */
+};
+
+struct fb_var_cursorinfo {
+	__u16 width;
+	__u16 height;
+	__u16 xspot;
+	__u16 yspot;
+	__u8 data[1];			/* field with [height][width]        */
+};
+
+struct fb_cursorstate {
+	__s16 xoffset;
+	__s16 yoffset;
+	__u16 mode;
+};
+
+#define FB_CURSOR_OFF		0
+#define FB_CURSOR_ON		1
+#define FB_CURSOR_FLASH		2
+
+
+	/*
+	 * Hardware Cursor
+	 */
+
+static int cursorrate = 20;	/* Number of frames/flash toggle */
+static u_short cursorstate = -1;
+static u_short cursormode = FB_CURSOR_OFF;
+
+static u_short *lofsprite, *shfsprite, *dummysprite;
+
+	/*
+	 * Current Video Mode
+	 */
+
+struct amifb_par {
+
+	/* General Values */
+
+	int xres;		/* vmode */
+	int yres;		/* vmode */
+	int vxres;		/* vmode */
+	int vyres;		/* vmode */
+	int xoffset;		/* vmode */
+	int yoffset;		/* vmode */
+	u_short bpp;		/* vmode */
+	u_short clk_shift;	/* vmode */
+	u_short line_shift;	/* vmode */
+	int vmode;		/* vmode */
+	u_short diwstrt_h;	/* vmode */
+	u_short diwstop_h;	/* vmode */
+	u_short diwstrt_v;	/* vmode */
+	u_short diwstop_v;	/* vmode */
+	u_long next_line;	/* modulo for next line */
+	u_long next_plane;	/* modulo for next plane */
+
+	/* Cursor Values */
+
+	struct {
+		short crsr_x;	/* movecursor */
+		short crsr_y;	/* movecursor */
+		short spot_x;
+		short spot_y;
+		u_short height;
+		u_short width;
+		u_short fmode;
+	} crsr;
+
+	/* OCS Hardware Registers */
+
+	u_long bplpt0;		/* vmode, pan (Note: physical address) */
+	u_long bplpt0wrap;	/* vmode, pan (Note: physical address) */
+	u_short ddfstrt;
+	u_short ddfstop;
+	u_short bpl1mod;
+	u_short bpl2mod;
+	u_short bplcon0;	/* vmode */
+	u_short bplcon1;	/* vmode */
+	u_short htotal;		/* vmode */
+	u_short vtotal;		/* vmode */
+
+	/* Additional ECS Hardware Registers */
+
+	u_short bplcon3;	/* vmode */
+	u_short beamcon0;	/* vmode */
+	u_short hsstrt;		/* vmode */
+	u_short hsstop;		/* vmode */
+	u_short hbstrt;		/* vmode */
+	u_short hbstop;		/* vmode */
+	u_short vsstrt;		/* vmode */
+	u_short vsstop;		/* vmode */
+	u_short vbstrt;		/* vmode */
+	u_short vbstop;		/* vmode */
+	u_short hcenter;	/* vmode */
+
+	/* Additional AGA Hardware Registers */
+
+	u_short fmode;		/* vmode */
+};
+
+
+	/*
+	 *  Saved color entry 0 so we can restore it when unblanking
+	 */
+
+static u_char red0, green0, blue0;
+
+
+#if defined(CONFIG_FB_AMIGA_ECS)
+static u_short ecs_palette[32];
+#endif
+
+
+	/*
+	 * Latches for Display Changes during VBlank
+	 */
+
+static u_short do_vmode_full = 0;	/* Change the Video Mode */
+static u_short do_vmode_pan = 0;	/* Update the Video Mode */
+static short do_blank = 0;		/* (Un)Blank the Screen (±1) */
+static u_short do_cursor = 0;		/* Move the Cursor */
+
+
+	/*
+	 * Various Flags
+	 */
+
+static u_short is_blanked = 0;		/* Screen is Blanked */
+static u_short is_lace = 0;		/* Screen is laced */
+
+	/*
+	 * Predefined Video Modes
+	 *
+	 */
+
+static struct fb_videomode ami_modedb[] __initdata = {
+
+	/*
+	 *  AmigaOS Video Modes
+	 *
+	 *  If you change these, make sure to update DEFMODE_* as well!
+	 */
+
+	{
+		/* 640x200, 15 kHz, 60 Hz (NTSC) */
+		"ntsc", 60, 640, 200, TAG_HIRES, 106, 86, 44, 16, 76, 2,
+		FB_SYNC_BROADCAST, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x400, 15 kHz, 60 Hz interlaced (NTSC) */
+		"ntsc-lace", 60, 640, 400, TAG_HIRES, 106, 86, 88, 33, 76, 4,
+		FB_SYNC_BROADCAST, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x256, 15 kHz, 50 Hz (PAL) */
+		"pal", 50, 640, 256, TAG_HIRES, 106, 86, 40, 14, 76, 2,
+		FB_SYNC_BROADCAST, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x512, 15 kHz, 50 Hz interlaced (PAL) */
+		"pal-lace", 50, 640, 512, TAG_HIRES, 106, 86, 80, 29, 76, 4,
+		FB_SYNC_BROADCAST, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x480, 29 kHz, 57 Hz */
+		"multiscan", 57, 640, 480, TAG_SHRES, 96, 112, 29, 8, 72, 8,
+		0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x960, 29 kHz, 57 Hz interlaced */
+		"multiscan-lace", 57, 640, 960, TAG_SHRES, 96, 112, 58, 16, 72,
+		16,
+		0, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x200, 15 kHz, 72 Hz */
+		"euro36", 72, 640, 200, TAG_HIRES, 92, 124, 6, 6, 52, 5,
+		0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x400, 15 kHz, 72 Hz interlaced */
+		"euro36-lace", 72, 640, 400, TAG_HIRES, 92, 124, 12, 12, 52,
+		10,
+		0, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x400, 29 kHz, 68 Hz */
+		"euro72", 68, 640, 400, TAG_SHRES, 164, 92, 9, 9, 80, 8,
+		0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x800, 29 kHz, 68 Hz interlaced */
+		"euro72-lace", 68, 640, 800, TAG_SHRES, 164, 92, 18, 18, 80,
+		16,
+		0, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 800x300, 23 kHz, 70 Hz */
+		"super72", 70, 800, 300, TAG_SHRES, 212, 140, 10, 11, 80, 7,
+		0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 800x600, 23 kHz, 70 Hz interlaced */
+		"super72-lace", 70, 800, 600, TAG_SHRES, 212, 140, 20, 22, 80,
+		14,
+		0, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x200, 27 kHz, 57 Hz doublescan */
+		"dblntsc", 57, 640, 200, TAG_SHRES, 196, 124, 18, 17, 80, 4,
+		0, FB_VMODE_DOUBLE | FB_VMODE_YWRAP
+	}, {
+		/* 640x400, 27 kHz, 57 Hz */
+		"dblntsc-ff", 57, 640, 400, TAG_SHRES, 196, 124, 36, 35, 80, 7,
+		0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x800, 27 kHz, 57 Hz interlaced */
+		"dblntsc-lace", 57, 640, 800, TAG_SHRES, 196, 124, 72, 70, 80,
+		14,
+		0, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x256, 27 kHz, 47 Hz doublescan */
+		"dblpal", 47, 640, 256, TAG_SHRES, 196, 124, 14, 13, 80, 4,
+		0, FB_VMODE_DOUBLE | FB_VMODE_YWRAP
+	}, {
+		/* 640x512, 27 kHz, 47 Hz */
+		"dblpal-ff", 47, 640, 512, TAG_SHRES, 196, 124, 28, 27, 80, 7,
+		0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x1024, 27 kHz, 47 Hz interlaced */
+		"dblpal-lace", 47, 640, 1024, TAG_SHRES, 196, 124, 56, 54, 80,
+		14,
+		0, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
+	},
+
+	/*
+	 *  VGA Video Modes
+	 */
+
+	{
+		/* 640x480, 31 kHz, 60 Hz (VGA) */
+		"vga", 60, 640, 480, TAG_SHRES, 64, 96, 30, 9, 112, 2,
+		0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 640x400, 31 kHz, 70 Hz (VGA) */
+		"vga70", 70, 640, 400, TAG_SHRES, 64, 96, 35, 12, 112, 2,
+		FB_SYNC_VERT_HIGH_ACT | FB_SYNC_COMP_HIGH_ACT,
+		FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	},
+
+#if 0
+
+	/*
+	 *  A2024 video modes
+	 *  These modes don't work yet because there's no A2024 driver.
+	 */
+
+	{
+		/* 1024x800, 10 Hz */
+		"a2024-10", 10, 1024, 800, TAG_HIRES, 0, 0, 0, 0, 0, 0,
+		0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	}, {
+		/* 1024x800, 15 Hz */
+		"a2024-15", 15, 1024, 800, TAG_HIRES, 0, 0, 0, 0, 0, 0,
+		0, FB_VMODE_NONINTERLACED | FB_VMODE_YWRAP
+	}
+#endif
+};
+
+#define NUM_TOTAL_MODES  ARRAY_SIZE(ami_modedb)
+
+static char *mode_option __initdata = NULL;
+static int round_down_bpp = 1;	/* for mode probing */
+
+	/*
+	 * Some default modes
+	 */
+
+
+#define DEFMODE_PAL	    2	/* "pal" for PAL OCS/ECS */
+#define DEFMODE_NTSC	    0	/* "ntsc" for NTSC OCS/ECS */
+#define DEFMODE_AMBER_PAL   3	/* "pal-lace" for flicker fixed PAL (A3000) */
+#define DEFMODE_AMBER_NTSC  1	/* "ntsc-lace" for flicker fixed NTSC (A3000) */
+#define DEFMODE_AGA	    19	/* "vga70" for AGA */
+
+
+static int amifb_ilbm = 0;	/* interleaved or normal bitplanes */
+
+static u32 amifb_hfmin __initdata;	/* monitor hfreq lower limit (Hz) */
+static u32 amifb_hfmax __initdata;	/* monitor hfreq upper limit (Hz) */
+static u16 amifb_vfmin __initdata;	/* monitor vfreq lower limit (Hz) */
+static u16 amifb_vfmax __initdata;	/* monitor vfreq upper limit (Hz) */
+
+
+	/*
+	 * Macros for the conversion from real world values to hardware register
+	 * values
+	 *
+	 * This helps us to keep our attention on the real stuff...
+	 *
+	 * Hardware limits for AGA:
+	 *
+	 *	parameter  min    max  step
+	 *	---------  ---   ----  ----
+	 *	diwstrt_h    0   2047     1
+	 *	diwstrt_v    0   2047     1
+	 *	diwstop_h    0   4095     1
+	 *	diwstop_v    0   4095     1
+	 *
+	 *	ddfstrt      0   2032    16
+	 *	ddfstop      0   2032    16
+	 *
+	 *	htotal       8   2048     8
+	 *	hsstrt       0   2040     8
+	 *	hsstop       0   2040     8
+	 *	vtotal       1   4096     1
+	 *	vsstrt       0   4095     1
+	 *	vsstop       0   4095     1
+	 *	hcenter      0   2040     8
+	 *
+	 *	hbstrt       0   2047     1
+	 *	hbstop       0   2047     1
+	 *	vbstrt       0   4095     1
+	 *	vbstop       0   4095     1
+	 *
+	 * Horizontal values are in 35 ns (SHRES) pixels
+	 * Vertical values are in half scanlines
+	 */
+
+/* bplcon1 (smooth scrolling) */
+
+#define hscroll2hw(hscroll) \
+	(((hscroll) << 12 & 0x3000) | ((hscroll) << 8 & 0xc300) | \
+	 ((hscroll) << 4 & 0x0c00) | ((hscroll) << 2 & 0x00f0) | \
+	 ((hscroll)>>2 & 0x000f))
+
+/* diwstrt/diwstop/diwhigh (visible display window) */
+
+#define diwstrt2hw(diwstrt_h, diwstrt_v) \
+	(((diwstrt_v) << 7 & 0xff00) | ((diwstrt_h)>>2 & 0x00ff))
+#define diwstop2hw(diwstop_h, diwstop_v) \
+	(((diwstop_v) << 7 & 0xff00) | ((diwstop_h)>>2 & 0x00ff))
+#define diwhigh2hw(diwstrt_h, diwstrt_v, diwstop_h, diwstop_v) \
+	(((diwstop_h) << 3 & 0x2000) | ((diwstop_h) << 11 & 0x1800) | \
+	 ((diwstop_v)>>1 & 0x0700) | ((diwstrt_h)>>5 & 0x0020) | \
+	 ((diwstrt_h) << 3 & 0x0018) | ((diwstrt_v)>>9 & 0x0007))
+
+/* ddfstrt/ddfstop (display DMA) */
+
+#define ddfstrt2hw(ddfstrt)	div8(ddfstrt)
+#define ddfstop2hw(ddfstop)	div8(ddfstop)
+
+/* hsstrt/hsstop/htotal/vsstrt/vsstop/vtotal/hcenter (sync timings) */
+
+#define hsstrt2hw(hsstrt)	(div8(hsstrt))
+#define hsstop2hw(hsstop)	(div8(hsstop))
+#define htotal2hw(htotal)	(div8(htotal) - 1)
+#define vsstrt2hw(vsstrt)	(div2(vsstrt))
+#define vsstop2hw(vsstop)	(div2(vsstop))
+#define vtotal2hw(vtotal)	(div2(vtotal) - 1)
+#define hcenter2hw(htotal)	(div8(htotal))
+
+/* hbstrt/hbstop/vbstrt/vbstop (blanking timings) */
+
+#define hbstrt2hw(hbstrt)	(((hbstrt) << 8 & 0x0700) | ((hbstrt)>>3 & 0x00ff))
+#define hbstop2hw(hbstop)	(((hbstop) << 8 & 0x0700) | ((hbstop)>>3 & 0x00ff))
+#define vbstrt2hw(vbstrt)	(div2(vbstrt))
+#define vbstop2hw(vbstop)	(div2(vbstop))
+
+/* colour */
+
+#define rgb2hw8_high(red, green, blue) \
+	(((red & 0xf0) << 4) | (green & 0xf0) | ((blue & 0xf0)>>4))
+#define rgb2hw8_low(red, green, blue) \
+	(((red & 0x0f) << 8) | ((green & 0x0f) << 4) | (blue & 0x0f))
+#define rgb2hw4(red, green, blue) \
+	(((red & 0xf0) << 4) | (green & 0xf0) | ((blue & 0xf0)>>4))
+#define rgb2hw2(red, green, blue) \
+	(((red & 0xc0) << 4) | (green & 0xc0) | ((blue & 0xc0)>>4))
+
+/* sprpos/sprctl (sprite positioning) */
+
+#define spr2hw_pos(start_v, start_h) \
+	(((start_v) << 7 & 0xff00) | ((start_h)>>3 & 0x00ff))
+#define spr2hw_ctl(start_v, start_h, stop_v) \
+	(((stop_v) << 7 & 0xff00) | ((start_v)>>4 & 0x0040) | \
+	 ((stop_v)>>5 & 0x0020) | ((start_h) << 3 & 0x0018) | \
+	 ((start_v)>>7 & 0x0004) | ((stop_v)>>8 & 0x0002) | \
+	 ((start_h)>>2 & 0x0001))
+
+/* get current vertical position of beam */
+#define get_vbpos()	((u_short)((*(u_long volatile *)&custom.vposr >> 7) & 0xffe))
+
+	/*
+	 * Copper Initialisation List
+	 */
+
+#define COPINITSIZE (sizeof(copins) * 40)
+
+enum {
+	cip_bplcon0
+};
+
+	/*
+	 * Long Frame/Short Frame Copper List
+	 * Don't change the order, build_copper()/rebuild_copper() rely on this
+	 */
+
+#define COPLISTSIZE (sizeof(copins) * 64)
+
+enum {
+	cop_wait, cop_bplcon0,
+	cop_spr0ptrh, cop_spr0ptrl,
+	cop_diwstrt, cop_diwstop,
+	cop_diwhigh,
+};
+
+	/*
+	 * Pixel modes for Bitplanes and Sprites
+	 */
+
+static u_short bplpixmode[3] = {
+	BPC0_SHRES,			/*  35 ns */
+	BPC0_HIRES,			/*  70 ns */
+	0				/* 140 ns */
+};
+
+static u_short sprpixmode[3] = {
+	BPC3_SPRES1 | BPC3_SPRES0,	/*  35 ns */
+	BPC3_SPRES1,			/*  70 ns */
+	BPC3_SPRES0			/* 140 ns */
+};
+
+	/*
+	 * Fetch modes for Bitplanes and Sprites
+	 */
+
+static u_short bplfetchmode[3] = {
+	0,				/* 1x */
+	FMODE_BPL32,			/* 2x */
+	FMODE_BPAGEM | FMODE_BPL32	/* 4x */
+};
+
+static u_short sprfetchmode[3] = {
+	0,				/* 1x */
+	FMODE_SPR32,			/* 2x */
+	FMODE_SPAGEM | FMODE_SPR32	/* 4x */
+};
+
+
+/* --------------------------- Hardware routines --------------------------- */
+
+	/*
+	 * Get the video params out of `var'. If a value doesn't fit, round
+	 * it up, if it's too big, return -EINVAL.
+	 */
+
+static int ami_decode_var(struct fb_var_screeninfo *var, struct amifb_par *par,
+			  const struct fb_info *info)
+{
+	u_short clk_shift, line_shift;
+	u_long maxfetchstop, fstrt, fsize, fconst, xres_n, yres_n;
+	u_int htotal, vtotal;
+
+	/*
+	 * Find a matching Pixel Clock
+	 */
+
+	for (clk_shift = TAG_SHRES; clk_shift <= TAG_LORES; clk_shift++)
+		if (var->pixclock <= pixclock[clk_shift])
+			break;
+	if (clk_shift > TAG_LORES) {
+		DPRINTK("pixclock too high\n");
+		return -EINVAL;
+	}
+	par->clk_shift = clk_shift;
+
+	/*
+	 * Check the Geometry Values
+	 */
+
+	if ((par->xres = var->xres) < 64)
+		par->xres = 64;
+	if ((par->yres = var->yres) < 64)
+		par->yres = 64;
+	if ((par->vxres = var->xres_virtual) < par->xres)
+		par->vxres = par->xres;
+	if ((par->vyres = var->yres_virtual) < par->yres)
+		par->vyres = par->yres;
+
+	par->bpp = var->bits_per_pixel;
+	if (!var->nonstd) {
+		if (par->bpp < 1)
+			par->bpp = 1;
+		if (par->bpp > maxdepth[clk_shift]) {
+			if (round_down_bpp && maxdepth[clk_shift])
+				par->bpp = maxdepth[clk_shift];
+			else {
+				DPRINTK("invalid bpp\n");
+				return -EINVAL;
+			}
+		}
+	} else if (var->nonstd == FB_NONSTD_HAM) {
+		if (par->bpp < 6)
+			par->bpp = 6;
+		if (par->bpp != 6) {
+			if (par->bpp < 8)
+				par->bpp = 8;
+			if (par->bpp != 8 || !IS_AGA) {
+				DPRINTK("invalid bpp for ham mode\n");
+				return -EINVAL;
+			}
+		}
+	} else {
+		DPRINTK("unknown nonstd mode\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * FB_VMODE_SMOOTH_XPAN will be cleared, if one of the following
+	 * checks failed and smooth scrolling is not possible
+	 */
+
+	par->vmode = var->vmode | FB_VMODE_SMOOTH_XPAN;
+	switch (par->vmode & FB_VMODE_MASK) {
+	case FB_VMODE_INTERLACED:
+		line_shift = 0;
+		break;
+	case FB_VMODE_NONINTERLACED:
+		line_shift = 1;
+		break;
+	case FB_VMODE_DOUBLE:
+		if (!IS_AGA) {
+			DPRINTK("double mode only possible with aga\n");
+			return -EINVAL;
+		}
+		line_shift = 2;
+		break;
+	default:
+		DPRINTK("unknown video mode\n");
+		return -EINVAL;
+		break;
+	}
+	par->line_shift = line_shift;
+
+	/*
+	 * Vertical and Horizontal Timings
+	 */
+
+	xres_n = par->xres << clk_shift;
+	yres_n = par->yres << line_shift;
+	par->htotal = down8((var->left_margin + par->xres + var->right_margin +
+			     var->hsync_len) << clk_shift);
+	par->vtotal =
+		down2(((var->upper_margin + par->yres + var->lower_margin +
+			var->vsync_len) << line_shift) + 1);
+
+	if (IS_AGA)
+		par->bplcon3 = sprpixmode[clk_shift];
+	else
+		par->bplcon3 = 0;
+	if (var->sync & FB_SYNC_BROADCAST) {
+		par->diwstop_h = par->htotal -
+			((var->right_margin - var->hsync_len) << clk_shift);
+		if (IS_AGA)
+			par->diwstop_h += mod4(var->hsync_len);
+		else
+			par->diwstop_h = down4(par->diwstop_h);
+
+		par->diwstrt_h = par->diwstop_h - xres_n;
+		par->diwstop_v = par->vtotal -
+			((var->lower_margin - var->vsync_len) << line_shift);
+		par->diwstrt_v = par->diwstop_v - yres_n;
+		if (par->diwstop_h >= par->htotal + 8) {
+			DPRINTK("invalid diwstop_h\n");
+			return -EINVAL;
+		}
+		if (par->diwstop_v > par->vtotal) {
+			DPRINTK("invalid diwstop_v\n");
+			return -EINVAL;
+		}
+
+		if (!IS_OCS) {
+			/* Initialize sync with some reasonable values for pwrsave */
+			par->hsstrt = 160;
+			par->hsstop = 320;
+			par->vsstrt = 30;
+			par->vsstop = 34;
+		} else {
+			par->hsstrt = 0;
+			par->hsstop = 0;
+			par->vsstrt = 0;
+			par->vsstop = 0;
+		}
+		if (par->vtotal > (PAL_VTOTAL + NTSC_VTOTAL) / 2) {
+			/* PAL video mode */
+			if (par->htotal != PAL_HTOTAL) {
+				DPRINTK("htotal invalid for pal\n");
+				return -EINVAL;
+			}
+			if (par->diwstrt_h < PAL_DIWSTRT_H) {
+				DPRINTK("diwstrt_h too low for pal\n");
+				return -EINVAL;
+			}
+			if (par->diwstrt_v < PAL_DIWSTRT_V) {
+				DPRINTK("diwstrt_v too low for pal\n");
+				return -EINVAL;
+			}
+			htotal = PAL_HTOTAL>>clk_shift;
+			vtotal = PAL_VTOTAL>>1;
+			if (!IS_OCS) {
+				par->beamcon0 = BMC0_PAL;
+				par->bplcon3 |= BPC3_BRDRBLNK;
+			} else if (AMIGAHW_PRESENT(AGNUS_HR_PAL) ||
+				   AMIGAHW_PRESENT(AGNUS_HR_NTSC)) {
+				par->beamcon0 = BMC0_PAL;
+				par->hsstop = 1;
+			} else if (amiga_vblank != 50) {
+				DPRINTK("pal not supported by this chipset\n");
+				return -EINVAL;
+			}
+		} else {
+			/* NTSC video mode
+			 * In the AGA chipset seems to be hardware bug with BPC3_BRDRBLNK
+			 * and NTSC activated, so than better let diwstop_h <= 1812
+			 */
+			if (par->htotal != NTSC_HTOTAL) {
+				DPRINTK("htotal invalid for ntsc\n");
+				return -EINVAL;
+			}
+			if (par->diwstrt_h < NTSC_DIWSTRT_H) {
+				DPRINTK("diwstrt_h too low for ntsc\n");
+				return -EINVAL;
+			}
+			if (par->diwstrt_v < NTSC_DIWSTRT_V) {
+				DPRINTK("diwstrt_v too low for ntsc\n");
+				return -EINVAL;
+			}
+			htotal = NTSC_HTOTAL>>clk_shift;
+			vtotal = NTSC_VTOTAL>>1;
+			if (!IS_OCS) {
+				par->beamcon0 = 0;
+				par->bplcon3 |= BPC3_BRDRBLNK;
+			} else if (AMIGAHW_PRESENT(AGNUS_HR_PAL) ||
+				   AMIGAHW_PRESENT(AGNUS_HR_NTSC)) {
+				par->beamcon0 = 0;
+				par->hsstop = 1;
+			} else if (amiga_vblank != 60) {
+				DPRINTK("ntsc not supported by this chipset\n");
+				return -EINVAL;
+			}
+		}
+		if (IS_OCS) {
+			if (par->diwstrt_h >= 1024 || par->diwstop_h < 1024 ||
+			    par->diwstrt_v >=  512 || par->diwstop_v <  256) {
+				DPRINTK("invalid position for display on ocs\n");
+				return -EINVAL;
+			}
+		}
+	} else if (!IS_OCS) {
+		/* Programmable video mode */
+		par->hsstrt = var->right_margin << clk_shift;
+		par->hsstop = (var->right_margin + var->hsync_len) << clk_shift;
+		par->diwstop_h = par->htotal - mod8(par->hsstrt) + 8 - (1 << clk_shift);
+		if (!IS_AGA)
+			par->diwstop_h = down4(par->diwstop_h) - 16;
+		par->diwstrt_h = par->diwstop_h - xres_n;
+		par->hbstop = par->diwstrt_h + 4;
+		par->hbstrt = par->diwstop_h + 4;
+		if (par->hbstrt >= par->htotal + 8)
+			par->hbstrt -= par->htotal;
+		par->hcenter = par->hsstrt + (par->htotal >> 1);
+		par->vsstrt = var->lower_margin << line_shift;
+		par->vsstop = (var->lower_margin + var->vsync_len) << line_shift;
+		par->diwstop_v = par->vtotal;
+		if ((par->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED)
+			par->diwstop_v -= 2;
+		par->diwstrt_v = par->diwstop_v - yres_n;
+		par->vbstop = par->diwstrt_v - 2;
+		par->vbstrt = par->diwstop_v - 2;
+		if (par->vtotal > 2048) {
+			DPRINTK("vtotal too high\n");
+			return -EINVAL;
+		}
+		if (par->htotal > 2048) {
+			DPRINTK("htotal too high\n");
+			return -EINVAL;
+		}
+		par->bplcon3 |= BPC3_EXTBLKEN;
+		par->beamcon0 = BMC0_HARDDIS | BMC0_VARVBEN | BMC0_LOLDIS |
+				BMC0_VARVSYEN | BMC0_VARHSYEN | BMC0_VARBEAMEN |
+				BMC0_PAL | BMC0_VARCSYEN;
+		if (var->sync & FB_SYNC_HOR_HIGH_ACT)
+			par->beamcon0 |= BMC0_HSYTRUE;
+		if (var->sync & FB_SYNC_VERT_HIGH_ACT)
+			par->beamcon0 |= BMC0_VSYTRUE;
+		if (var->sync & FB_SYNC_COMP_HIGH_ACT)
+			par->beamcon0 |= BMC0_CSYTRUE;
+		htotal = par->htotal>>clk_shift;
+		vtotal = par->vtotal>>1;
+	} else {
+		DPRINTK("only broadcast modes possible for ocs\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Checking the DMA timing
+	 */
+
+	fconst = 16 << maxfmode << clk_shift;
+
+	/*
+	 * smallest window start value without turn off other dma cycles
+	 * than sprite1-7, unless you change min_fstrt
+	 */
+
+
+	fsize = ((maxfmode + clk_shift <= 1) ? fconst : 64);
+	fstrt = downx(fconst, par->diwstrt_h - 4) - fsize;
+	if (fstrt < min_fstrt) {
+		DPRINTK("fetch start too low\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * smallest window start value where smooth scrolling is possible
+	 */
+
+	fstrt = downx(fconst, par->diwstrt_h - fconst + (1 << clk_shift) - 4) -
+		fsize;
+	if (fstrt < min_fstrt)
+		par->vmode &= ~FB_VMODE_SMOOTH_XPAN;
+
+	maxfetchstop = down16(par->htotal - 80);
+
+	fstrt = downx(fconst, par->diwstrt_h - 4) - 64 - fconst;
+	fsize = upx(fconst, xres_n +
+		    modx(fconst, downx(1 << clk_shift, par->diwstrt_h - 4)));
+	if (fstrt + fsize > maxfetchstop)
+		par->vmode &= ~FB_VMODE_SMOOTH_XPAN;
+
+	fsize = upx(fconst, xres_n);
+	if (fstrt + fsize > maxfetchstop) {
+		DPRINTK("fetch stop too high\n");
+		return -EINVAL;
+	}
+
+	if (maxfmode + clk_shift <= 1) {
+		fsize = up64(xres_n + fconst - 1);
+		if (min_fstrt + fsize - 64 > maxfetchstop)
+			par->vmode &= ~FB_VMODE_SMOOTH_XPAN;
+
+		fsize = up64(xres_n);
+		if (min_fstrt + fsize - 64 > maxfetchstop) {
+			DPRINTK("fetch size too high\n");
+			return -EINVAL;
+		}
+
+		fsize -= 64;
+	} else
+		fsize -= fconst;
+
+	/*
+	 * Check if there is enough time to update the bitplane pointers for ywrap
+	 */
+
+	if (par->htotal - fsize - 64 < par->bpp * 64)
+		par->vmode &= ~FB_VMODE_YWRAP;
+
+	/*
+	 * Bitplane calculations and check the Memory Requirements
+	 */
+
+	if (amifb_ilbm) {
+		par->next_plane = div8(upx(16 << maxfmode, par->vxres));
+		par->next_line = par->bpp * par->next_plane;
+		if (par->next_line * par->vyres > info->fix.smem_len) {
+			DPRINTK("too few video mem\n");
+			return -EINVAL;
+		}
+	} else {
+		par->next_line = div8(upx(16 << maxfmode, par->vxres));
+		par->next_plane = par->vyres * par->next_line;
+		if (par->next_plane * par->bpp > info->fix.smem_len) {
+			DPRINTK("too few video mem\n");
+			return -EINVAL;
+		}
+	}
+
+	/*
+	 * Hardware Register Values
+	 */
+
+	par->bplcon0 = BPC0_COLOR | bplpixmode[clk_shift];
+	if (!IS_OCS)
+		par->bplcon0 |= BPC0_ECSENA;
+	if (par->bpp == 8)
+		par->bplcon0 |= BPC0_BPU3;
+	else
+		par->bplcon0 |= par->bpp << 12;
+	if (var->nonstd == FB_NONSTD_HAM)
+		par->bplcon0 |= BPC0_HAM;
+	if (var->sync & FB_SYNC_EXT)
+		par->bplcon0 |= BPC0_ERSY;
+
+	if (IS_AGA)
+		par->fmode = bplfetchmode[maxfmode];
+
+	switch (par->vmode & FB_VMODE_MASK) {
+	case FB_VMODE_INTERLACED:
+		par->bplcon0 |= BPC0_LACE;
+		break;
+	case FB_VMODE_DOUBLE:
+		if (IS_AGA)
+			par->fmode |= FMODE_SSCAN2 | FMODE_BSCAN2;
+		break;
+	}
+
+	if (!((par->vmode ^ var->vmode) & FB_VMODE_YWRAP)) {
+		par->xoffset = var->xoffset;
+		par->yoffset = var->yoffset;
+		if (par->vmode & FB_VMODE_YWRAP) {
+			if (par->yoffset >= par->vyres)
+				par->xoffset = par->yoffset = 0;
+		} else {
+			if (par->xoffset > upx(16 << maxfmode, par->vxres - par->xres) ||
+			    par->yoffset > par->vyres - par->yres)
+				par->xoffset = par->yoffset = 0;
+		}
+	} else
+		par->xoffset = par->yoffset = 0;
+
+	par->crsr.crsr_x = par->crsr.crsr_y = 0;
+	par->crsr.spot_x = par->crsr.spot_y = 0;
+	par->crsr.height = par->crsr.width = 0;
+
+	return 0;
+}
+
+	/*
+	 * Fill the `var' structure based on the values in `par' and maybe
+	 * other values read out of the hardware.
+	 */
+
+static void ami_encode_var(struct fb_var_screeninfo *var,
+			   struct amifb_par *par)
+{
+	u_short clk_shift, line_shift;
+
+	memset(var, 0, sizeof(struct fb_var_screeninfo));
+
+	clk_shift = par->clk_shift;
+	line_shift = par->line_shift;
+
+	var->xres = par->xres;
+	var->yres = par->yres;
+	var->xres_virtual = par->vxres;
+	var->yres_virtual = par->vyres;
+	var->xoffset = par->xoffset;
+	var->yoffset = par->yoffset;
+
+	var->bits_per_pixel = par->bpp;
+	var->grayscale = 0;
+
+	var->red.offset = 0;
+	var->red.msb_right = 0;
+	var->red.length = par->bpp;
+	if (par->bplcon0 & BPC0_HAM)
+		var->red.length -= 2;
+	var->blue = var->green = var->red;
+	var->transp.offset = 0;
+	var->transp.length = 0;
+	var->transp.msb_right = 0;
+
+	if (par->bplcon0 & BPC0_HAM)
+		var->nonstd = FB_NONSTD_HAM;
+	else
+		var->nonstd = 0;
+	var->activate = 0;
+
+	var->height = -1;
+	var->width = -1;
+
+	var->pixclock = pixclock[clk_shift];
+
+	if (IS_AGA && par->fmode & FMODE_BSCAN2)
+		var->vmode = FB_VMODE_DOUBLE;
+	else if (par->bplcon0 & BPC0_LACE)
+		var->vmode = FB_VMODE_INTERLACED;
+	else
+		var->vmode = FB_VMODE_NONINTERLACED;
+
+	if (!IS_OCS && par->beamcon0 & BMC0_VARBEAMEN) {
+		var->hsync_len = (par->hsstop - par->hsstrt)>>clk_shift;
+		var->right_margin = par->hsstrt>>clk_shift;
+		var->left_margin = (par->htotal>>clk_shift) - var->xres - var->right_margin - var->hsync_len;
+		var->vsync_len = (par->vsstop - par->vsstrt)>>line_shift;
+		var->lower_margin = par->vsstrt>>line_shift;
+		var->upper_margin = (par->vtotal>>line_shift) - var->yres - var->lower_margin - var->vsync_len;
+		var->sync = 0;
+		if (par->beamcon0 & BMC0_HSYTRUE)
+			var->sync |= FB_SYNC_HOR_HIGH_ACT;
+		if (par->beamcon0 & BMC0_VSYTRUE)
+			var->sync |= FB_SYNC_VERT_HIGH_ACT;
+		if (par->beamcon0 & BMC0_CSYTRUE)
+			var->sync |= FB_SYNC_COMP_HIGH_ACT;
+	} else {
+		var->sync = FB_SYNC_BROADCAST;
+		var->hsync_len = (152>>clk_shift) + mod4(par->diwstop_h);
+		var->right_margin = ((par->htotal - down4(par->diwstop_h))>>clk_shift) + var->hsync_len;
+		var->left_margin = (par->htotal>>clk_shift) - var->xres - var->right_margin - var->hsync_len;
+		var->vsync_len = 4>>line_shift;
+		var->lower_margin = ((par->vtotal - par->diwstop_v)>>line_shift) + var->vsync_len;
+		var->upper_margin = (((par->vtotal - 2)>>line_shift) + 1) - var->yres -
+				    var->lower_margin - var->vsync_len;
+	}
+
+	if (par->bplcon0 & BPC0_ERSY)
+		var->sync |= FB_SYNC_EXT;
+	if (par->vmode & FB_VMODE_YWRAP)
+		var->vmode |= FB_VMODE_YWRAP;
+}
+
+
+	/*
+	 * Update hardware
+	 */
+
+static void ami_update_par(struct fb_info *info)
+{
+	struct amifb_par *par = info->par;
+	short clk_shift, vshift, fstrt, fsize, fstop, fconst,  shift, move, mod;
+
+	clk_shift = par->clk_shift;
+
+	if (!(par->vmode & FB_VMODE_SMOOTH_XPAN))
+		par->xoffset = upx(16 << maxfmode, par->xoffset);
+
+	fconst = 16 << maxfmode << clk_shift;
+	vshift = modx(16 << maxfmode, par->xoffset);
+	fstrt = par->diwstrt_h - (vshift << clk_shift) - 4;
+	fsize = (par->xres + vshift) << clk_shift;
+	shift = modx(fconst, fstrt);
+	move = downx(2 << maxfmode, div8(par->xoffset));
+	if (maxfmode + clk_shift > 1) {
+		fstrt = downx(fconst, fstrt) - 64;
+		fsize = upx(fconst, fsize);
+		fstop = fstrt + fsize - fconst;
+	} else {
+		mod = fstrt = downx(fconst, fstrt) - fconst;
+		fstop = fstrt + upx(fconst, fsize) - 64;
+		fsize = up64(fsize);
+		fstrt = fstop - fsize + 64;
+		if (fstrt < min_fstrt) {
+			fstop += min_fstrt - fstrt;
+			fstrt = min_fstrt;
+		}
+		move = move - div8((mod - fstrt)>>clk_shift);
+	}
+	mod = par->next_line - div8(fsize>>clk_shift);
+	par->ddfstrt = fstrt;
+	par->ddfstop = fstop;
+	par->bplcon1 = hscroll2hw(shift);
+	par->bpl2mod = mod;
+	if (par->bplcon0 & BPC0_LACE)
+		par->bpl2mod += par->next_line;
+	if (IS_AGA && (par->fmode & FMODE_BSCAN2))
+		par->bpl1mod = -div8(fsize>>clk_shift);
+	else
+		par->bpl1mod = par->bpl2mod;
+
+	if (par->yoffset) {
+		par->bplpt0 = info->fix.smem_start +
+			      par->next_line * par->yoffset + move;
+		if (par->vmode & FB_VMODE_YWRAP) {
+			if (par->yoffset > par->vyres - par->yres) {
+				par->bplpt0wrap = info->fix.smem_start + move;
+				if (par->bplcon0 & BPC0_LACE &&
+				    mod2(par->diwstrt_v + par->vyres -
+					 par->yoffset))
+					par->bplpt0wrap += par->next_line;
+			}
+		}
+	} else
+		par->bplpt0 = info->fix.smem_start + move;
+
+	if (par->bplcon0 & BPC0_LACE && mod2(par->diwstrt_v))
+		par->bplpt0 += par->next_line;
+}
+
+
+	/*
+	 * Pan or Wrap the Display
+	 *
+	 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
+	 * in `var'.
+	 */
+
+static void ami_pan_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+	struct amifb_par *par = info->par;
+
+	par->xoffset = var->xoffset;
+	par->yoffset = var->yoffset;
+	if (var->vmode & FB_VMODE_YWRAP)
+		par->vmode |= FB_VMODE_YWRAP;
+	else
+		par->vmode &= ~FB_VMODE_YWRAP;
+
+	do_vmode_pan = 0;
+	ami_update_par(info);
+	do_vmode_pan = 1;
+}
+
+
+static void ami_update_display(const struct amifb_par *par)
+{
+	custom.bplcon1 = par->bplcon1;
+	custom.bpl1mod = par->bpl1mod;
+	custom.bpl2mod = par->bpl2mod;
+	custom.ddfstrt = ddfstrt2hw(par->ddfstrt);
+	custom.ddfstop = ddfstop2hw(par->ddfstop);
+}
+
+	/*
+	 * Change the video mode (called by VBlank interrupt)
+	 */
+
+static void ami_init_display(const struct amifb_par *par)
+{
+	int i;
+
+	custom.bplcon0 = par->bplcon0 & ~BPC0_LACE;
+	custom.bplcon2 = (IS_OCS ? 0 : BPC2_KILLEHB) | BPC2_PF2P2 | BPC2_PF1P2;
+	if (!IS_OCS) {
+		custom.bplcon3 = par->bplcon3;
+		if (IS_AGA)
+			custom.bplcon4 = BPC4_ESPRM4 | BPC4_OSPRM4;
+		if (par->beamcon0 & BMC0_VARBEAMEN) {
+			custom.htotal = htotal2hw(par->htotal);
+			custom.hbstrt = hbstrt2hw(par->hbstrt);
+			custom.hbstop = hbstop2hw(par->hbstop);
+			custom.hsstrt = hsstrt2hw(par->hsstrt);
+			custom.hsstop = hsstop2hw(par->hsstop);
+			custom.hcenter = hcenter2hw(par->hcenter);
+			custom.vtotal = vtotal2hw(par->vtotal);
+			custom.vbstrt = vbstrt2hw(par->vbstrt);
+			custom.vbstop = vbstop2hw(par->vbstop);
+			custom.vsstrt = vsstrt2hw(par->vsstrt);
+			custom.vsstop = vsstop2hw(par->vsstop);
+		}
+	}
+	if (!IS_OCS || par->hsstop)
+		custom.beamcon0 = par->beamcon0;
+	if (IS_AGA)
+		custom.fmode = par->fmode;
+
+	/*
+	 * The minimum period for audio depends on htotal
+	 */
+
+	amiga_audio_min_period = div16(par->htotal);
+
+	is_lace = par->bplcon0 & BPC0_LACE ? 1 : 0;
+#if 1
+	if (is_lace) {
+		i = custom.vposr >> 15;
+	} else {
+		custom.vposw = custom.vposr | 0x8000;
+		i = 1;
+	}
+#else
+	i = 1;
+	custom.vposw = custom.vposr | 0x8000;
+#endif
+	custom.cop2lc = (u_short *)ZTWO_PADDR(copdisplay.list[currentcop][i]);
+}
+
+	/*
+	 * (Un)Blank the screen (called by VBlank interrupt)
+	 */
+
+static void ami_do_blank(const struct amifb_par *par)
+{
+#if defined(CONFIG_FB_AMIGA_AGA)
+	u_short bplcon3 = par->bplcon3;
+#endif
+	u_char red, green, blue;
+
+	if (do_blank > 0) {
+		custom.dmacon = DMAF_RASTER | DMAF_SPRITE;
+		red = green = blue = 0;
+		if (!IS_OCS && do_blank > 1) {
+			switch (do_blank) {
+			case FB_BLANK_VSYNC_SUSPEND:
+				custom.hsstrt = hsstrt2hw(par->hsstrt);
+				custom.hsstop = hsstop2hw(par->hsstop);
+				custom.vsstrt = vsstrt2hw(par->vtotal + 4);
+				custom.vsstop = vsstop2hw(par->vtotal + 4);
+				break;
+			case FB_BLANK_HSYNC_SUSPEND:
+				custom.hsstrt = hsstrt2hw(par->htotal + 16);
+				custom.hsstop = hsstop2hw(par->htotal + 16);
+				custom.vsstrt = vsstrt2hw(par->vsstrt);
+				custom.vsstop = vsstrt2hw(par->vsstop);
+				break;
+			case FB_BLANK_POWERDOWN:
+				custom.hsstrt = hsstrt2hw(par->htotal + 16);
+				custom.hsstop = hsstop2hw(par->htotal + 16);
+				custom.vsstrt = vsstrt2hw(par->vtotal + 4);
+				custom.vsstop = vsstop2hw(par->vtotal + 4);
+				break;
+			}
+			if (!(par->beamcon0 & BMC0_VARBEAMEN)) {
+				custom.htotal = htotal2hw(par->htotal);
+				custom.vtotal = vtotal2hw(par->vtotal);
+				custom.beamcon0 = BMC0_HARDDIS | BMC0_VARBEAMEN |
+						  BMC0_VARVSYEN | BMC0_VARHSYEN | BMC0_VARCSYEN;
+			}
+		}
+	} else {
+		custom.dmacon = DMAF_SETCLR | DMAF_RASTER | DMAF_SPRITE;
+		red = red0;
+		green = green0;
+		blue = blue0;
+		if (!IS_OCS) {
+			custom.hsstrt = hsstrt2hw(par->hsstrt);
+			custom.hsstop = hsstop2hw(par->hsstop);
+			custom.vsstrt = vsstrt2hw(par->vsstrt);
+			custom.vsstop = vsstop2hw(par->vsstop);
+			custom.beamcon0 = par->beamcon0;
+		}
+	}
+#if defined(CONFIG_FB_AMIGA_AGA)
+	if (IS_AGA) {
+		custom.bplcon3 = bplcon3;
+		custom.color[0] = rgb2hw8_high(red, green, blue);
+		custom.bplcon3 = bplcon3 | BPC3_LOCT;
+		custom.color[0] = rgb2hw8_low(red, green, blue);
+		custom.bplcon3 = bplcon3;
+	} else
+#endif
+#if defined(CONFIG_FB_AMIGA_ECS)
+	if (par->bplcon0 & BPC0_SHRES) {
+		u_short color, mask;
+		int i;
+
+		mask = 0x3333;
+		color = rgb2hw2(red, green, blue);
+		for (i = 12; i >= 0; i -= 4)
+			custom.color[i] = ecs_palette[i] = (ecs_palette[i] & mask) | color;
+		mask <<= 2; color >>= 2;
+		for (i = 3; i >= 0; i--)
+			custom.color[i] = ecs_palette[i] = (ecs_palette[i] & mask) | color;
+	} else
+#endif
+		custom.color[0] = rgb2hw4(red, green, blue);
+	is_blanked = do_blank > 0 ? do_blank : 0;
+}
+
+static int ami_get_fix_cursorinfo(struct fb_fix_cursorinfo *fix,
+				  const struct amifb_par *par)
+{
+	fix->crsr_width = fix->crsr_xsize = par->crsr.width;
+	fix->crsr_height = fix->crsr_ysize = par->crsr.height;
+	fix->crsr_color1 = 17;
+	fix->crsr_color2 = 18;
+	return 0;
+}
+
+static int ami_get_var_cursorinfo(struct fb_var_cursorinfo *var,
+				  u_char __user *data,
+				  const struct amifb_par *par)
+{
+	register u_short *lspr, *sspr;
+#ifdef __mc68000__
+	register u_long datawords asm ("d2");
+#else
+	register u_long datawords;
+#endif
+	register short delta;
+	register u_char color;
+	short height, width, bits, words;
+	int size, alloc;
+
+	size = par->crsr.height * par->crsr.width;
+	alloc = var->height * var->width;
+	var->height = par->crsr.height;
+	var->width = par->crsr.width;
+	var->xspot = par->crsr.spot_x;
+	var->yspot = par->crsr.spot_y;
+	if (size > var->height * var->width)
+		return -ENAMETOOLONG;
+	delta = 1 << par->crsr.fmode;
+	lspr = lofsprite + (delta << 1);
+	if (par->bplcon0 & BPC0_LACE)
+		sspr = shfsprite + (delta << 1);
+	else
+		sspr = NULL;
+	for (height = (short)var->height - 1; height >= 0; height--) {
+		bits = 0; words = delta; datawords = 0;
+		for (width = (short)var->width - 1; width >= 0; width--) {
+			if (bits == 0) {
+				bits = 16; --words;
+#ifdef __mc68000__
+				asm volatile ("movew %1@(%3:w:2),%0 ; swap %0 ; movew %1@+,%0"
+					: "=d" (datawords), "=a" (lspr) : "1" (lspr), "d" (delta));
+#else
+				datawords = (*(lspr + delta) << 16) | (*lspr++);
+#endif
+			}
+			--bits;
+#ifdef __mc68000__
+			asm volatile (
+				"clrb %0 ; swap %1 ; lslw #1,%1 ; roxlb #1,%0 ; "
+				"swap %1 ; lslw #1,%1 ; roxlb #1,%0"
+				: "=d" (color), "=d" (datawords) : "1" (datawords));
+#else
+			color = (((datawords >> 30) & 2)
+				 | ((datawords >> 15) & 1));
+			datawords <<= 1;
+#endif
+			/* FIXME: check the return value + test the change */
+			put_user(color, data++);
+		}
+		if (bits > 0) {
+			--words; ++lspr;
+		}
+		while (--words >= 0)
+			++lspr;
+#ifdef __mc68000__
+		asm volatile ("lea %0@(%4:w:2),%0 ; tstl %1 ; jeq 1f ; exg %0,%1\n1:"
+			: "=a" (lspr), "=a" (sspr) : "0" (lspr), "1" (sspr), "d" (delta));
+#else
+		lspr += delta;
+		if (sspr) {
+			u_short *tmp = lspr;
+			lspr = sspr;
+			sspr = tmp;
+		}
+#endif
+	}
+	return 0;
+}
+
+static int ami_set_var_cursorinfo(struct fb_var_cursorinfo *var,
+				  u_char __user *data, struct amifb_par *par)
+{
+	register u_short *lspr, *sspr;
+#ifdef __mc68000__
+	register u_long datawords asm ("d2");
+#else
+	register u_long datawords;
+#endif
+	register short delta;
+	u_short fmode;
+	short height, width, bits, words;
+
+	if (!var->width)
+		return -EINVAL;
+	else if (var->width <= 16)
+		fmode = TAG_FMODE_1;
+	else if (var->width <= 32)
+		fmode = TAG_FMODE_2;
+	else if (var->width <= 64)
+		fmode = TAG_FMODE_4;
+	else
+		return -EINVAL;
+	if (fmode > maxfmode)
+		return -EINVAL;
+	if (!var->height)
+		return -EINVAL;
+	delta = 1 << fmode;
+	lofsprite = shfsprite = (u_short *)spritememory;
+	lspr = lofsprite + (delta << 1);
+	if (par->bplcon0 & BPC0_LACE) {
+		if (((var->height + 4) << fmode << 2) > SPRITEMEMSIZE)
+			return -EINVAL;
+		memset(lspr, 0, (var->height + 4) << fmode << 2);
+		shfsprite += ((var->height + 5)&-2) << fmode;
+		sspr = shfsprite + (delta << 1);
+	} else {
+		if (((var->height + 2) << fmode << 2) > SPRITEMEMSIZE)
+			return -EINVAL;
+		memset(lspr, 0, (var->height + 2) << fmode << 2);
+		sspr = NULL;
+	}
+	for (height = (short)var->height - 1; height >= 0; height--) {
+		bits = 16; words = delta; datawords = 0;
+		for (width = (short)var->width - 1; width >= 0; width--) {
+			unsigned long tdata = 0;
+			/* FIXME: check the return value + test the change */
+			get_user(tdata, data);
+			data++;
+#ifdef __mc68000__
+			asm volatile (
+				"lsrb #1,%2 ; roxlw #1,%0 ; swap %0 ; "
+				"lsrb #1,%2 ; roxlw #1,%0 ; swap %0"
+				: "=d" (datawords)
+				: "0" (datawords), "d" (tdata));
+#else
+			datawords = ((datawords << 1) & 0xfffefffe);
+			datawords |= tdata & 1;
+			datawords |= (tdata & 2) << (16 - 1);
+#endif
+			if (--bits == 0) {
+				bits = 16; --words;
+#ifdef __mc68000__
+				asm volatile ("swap %2 ; movew %2,%0@(%3:w:2) ; swap %2 ; movew %2,%0@+"
+					: "=a" (lspr) : "0" (lspr), "d" (datawords), "d" (delta));
+#else
+				*(lspr + delta) = (u_short) (datawords >> 16);
+				*lspr++ = (u_short) (datawords & 0xffff);
+#endif
+			}
+		}
+		if (bits < 16) {
+			--words;
+#ifdef __mc68000__
+			asm volatile (
+				"swap %2 ; lslw %4,%2 ; movew %2,%0@(%3:w:2) ; "
+				"swap %2 ; lslw %4,%2 ; movew %2,%0@+"
+				: "=a" (lspr) : "0" (lspr), "d" (datawords), "d" (delta), "d" (bits));
+#else
+			*(lspr + delta) = (u_short) (datawords >> (16 + bits));
+			*lspr++ = (u_short) ((datawords & 0x0000ffff) >> bits);
+#endif
+		}
+		while (--words >= 0) {
+#ifdef __mc68000__
+			asm volatile ("moveql #0,%%d0 ; movew %%d0,%0@(%2:w:2) ; movew %%d0,%0@+"
+				: "=a" (lspr) : "0" (lspr), "d" (delta) : "d0");
+#else
+			*(lspr + delta) = 0;
+			*lspr++ = 0;
+#endif
+		}
+#ifdef __mc68000__
+		asm volatile ("lea %0@(%4:w:2),%0 ; tstl %1 ; jeq 1f ; exg %0,%1\n1:"
+			: "=a" (lspr), "=a" (sspr) : "0" (lspr), "1" (sspr), "d" (delta));
+#else
+		lspr += delta;
+		if (sspr) {
+			u_short *tmp = lspr;
+			lspr = sspr;
+			sspr = tmp;
+		}
+#endif
+	}
+	par->crsr.height = var->height;
+	par->crsr.width = var->width;
+	par->crsr.spot_x = var->xspot;
+	par->crsr.spot_y = var->yspot;
+	par->crsr.fmode = fmode;
+	if (IS_AGA) {
+		par->fmode &= ~(FMODE_SPAGEM | FMODE_SPR32);
+		par->fmode |= sprfetchmode[fmode];
+		custom.fmode = par->fmode;
+	}
+	return 0;
+}
+
+static int ami_get_cursorstate(struct fb_cursorstate *state,
+			       const struct amifb_par *par)
+{
+	state->xoffset = par->crsr.crsr_x;
+	state->yoffset = par->crsr.crsr_y;
+	state->mode = cursormode;
+	return 0;
+}
+
+static int ami_set_cursorstate(struct fb_cursorstate *state,
+			       struct amifb_par *par)
+{
+	par->crsr.crsr_x = state->xoffset;
+	par->crsr.crsr_y = state->yoffset;
+	if ((cursormode = state->mode) == FB_CURSOR_OFF)
+		cursorstate = -1;
+	do_cursor = 1;
+	return 0;
+}
+
+static void ami_set_sprite(const struct amifb_par *par)
+{
+	copins *copl, *cops;
+	u_short hs, vs, ve;
+	u_long pl, ps;
+	short mx, my;
+
+	cops = copdisplay.list[currentcop][0];
+	copl = copdisplay.list[currentcop][1];
+	ps = pl = ZTWO_PADDR(dummysprite);
+	mx = par->crsr.crsr_x - par->crsr.spot_x;
+	my = par->crsr.crsr_y - par->crsr.spot_y;
+	if (!(par->vmode & FB_VMODE_YWRAP)) {
+		mx -= par->xoffset;
+		my -= par->yoffset;
+	}
+	if (!is_blanked && cursorstate > 0 && par->crsr.height > 0 &&
+	    mx > -(short)par->crsr.width && mx < par->xres &&
+	    my > -(short)par->crsr.height && my < par->yres) {
+		pl = ZTWO_PADDR(lofsprite);
+		hs = par->diwstrt_h + (mx << par->clk_shift) - 4;
+		vs = par->diwstrt_v + (my << par->line_shift);
+		ve = vs + (par->crsr.height << par->line_shift);
+		if (par->bplcon0 & BPC0_LACE) {
+			ps = ZTWO_PADDR(shfsprite);
+			lofsprite[0] = spr2hw_pos(vs, hs);
+			shfsprite[0] = spr2hw_pos(vs + 1, hs);
+			if (mod2(vs)) {
+				lofsprite[1 << par->crsr.fmode] = spr2hw_ctl(vs, hs, ve);
+				shfsprite[1 << par->crsr.fmode] = spr2hw_ctl(vs + 1, hs, ve + 1);
+				swap(pl, ps);
+			} else {
+				lofsprite[1 << par->crsr.fmode] = spr2hw_ctl(vs, hs, ve + 1);
+				shfsprite[1 << par->crsr.fmode] = spr2hw_ctl(vs + 1, hs, ve);
+			}
+		} else {
+			lofsprite[0] = spr2hw_pos(vs, hs) | (IS_AGA && (par->fmode & FMODE_BSCAN2) ? 0x80 : 0);
+			lofsprite[1 << par->crsr.fmode] = spr2hw_ctl(vs, hs, ve);
+		}
+	}
+	copl[cop_spr0ptrh].w[1] = highw(pl);
+	copl[cop_spr0ptrl].w[1] = loww(pl);
+	if (par->bplcon0 & BPC0_LACE) {
+		cops[cop_spr0ptrh].w[1] = highw(ps);
+		cops[cop_spr0ptrl].w[1] = loww(ps);
+	}
+}
+
+
+	/*
+	 * Initialise the Copper Initialisation List
+	 */
+
+static void __init ami_init_copper(void)
+{
+	copins *cop = copdisplay.init;
+	u_long p;
+	int i;
+
+	if (!IS_OCS) {
+		(cop++)->l = CMOVE(BPC0_COLOR | BPC0_SHRES | BPC0_ECSENA, bplcon0);
+		(cop++)->l = CMOVE(0x0181, diwstrt);
+		(cop++)->l = CMOVE(0x0281, diwstop);
+		(cop++)->l = CMOVE(0x0000, diwhigh);
+	} else
+		(cop++)->l = CMOVE(BPC0_COLOR, bplcon0);
+	p = ZTWO_PADDR(dummysprite);
+	for (i = 0; i < 8; i++) {
+		(cop++)->l = CMOVE(0, spr[i].pos);
+		(cop++)->l = CMOVE(highw(p), sprpt[i]);
+		(cop++)->l = CMOVE2(loww(p), sprpt[i]);
+	}
+
+	(cop++)->l = CMOVE(IF_SETCLR | IF_COPER, intreq);
+	copdisplay.wait = cop;
+	(cop++)->l = CEND;
+	(cop++)->l = CMOVE(0, copjmp2);
+	cop->l = CEND;
+
+	custom.cop1lc = (u_short *)ZTWO_PADDR(copdisplay.init);
+	custom.copjmp1 = 0;
+}
+
+static void ami_reinit_copper(const struct amifb_par *par)
+{
+	copdisplay.init[cip_bplcon0].w[1] = ~(BPC0_BPU3 | BPC0_BPU2 | BPC0_BPU1 | BPC0_BPU0) & par->bplcon0;
+	copdisplay.wait->l = CWAIT(32, par->diwstrt_v - 4);
+}
+
+
+	/*
+	 * Rebuild the Copper List
+	 *
+	 * We only change the things that are not static
+	 */
+
+static void ami_rebuild_copper(const struct amifb_par *par)
+{
+	copins *copl, *cops;
+	u_short line, h_end1, h_end2;
+	short i;
+	u_long p;
+
+	if (IS_AGA && maxfmode + par->clk_shift == 0)
+		h_end1 = par->diwstrt_h - 64;
+	else
+		h_end1 = par->htotal - 32;
+	h_end2 = par->ddfstop + 64;
+
+	ami_set_sprite(par);
+
+	copl = copdisplay.rebuild[1];
+	p = par->bplpt0;
+	if (par->vmode & FB_VMODE_YWRAP) {
+		if ((par->vyres - par->yoffset) != 1 || !mod2(par->diwstrt_v)) {
+			if (par->yoffset > par->vyres - par->yres) {
+				for (i = 0; i < (short)par->bpp; i++, p += par->next_plane) {
+					(copl++)->l = CMOVE(highw(p), bplpt[i]);
+					(copl++)->l = CMOVE2(loww(p), bplpt[i]);
+				}
+				line = par->diwstrt_v + ((par->vyres - par->yoffset) << par->line_shift) - 1;
+				while (line >= 512) {
+					(copl++)->l = CWAIT(h_end1, 510);
+					line -= 512;
+				}
+				if (line >= 510 && IS_AGA && maxfmode + par->clk_shift == 0)
+					(copl++)->l = CWAIT(h_end1, line);
+				else
+					(copl++)->l = CWAIT(h_end2, line);
+				p = par->bplpt0wrap;
+			}
+		} else
+			p = par->bplpt0wrap;
+	}
+	for (i = 0; i < (short)par->bpp; i++, p += par->next_plane) {
+		(copl++)->l = CMOVE(highw(p), bplpt[i]);
+		(copl++)->l = CMOVE2(loww(p), bplpt[i]);
+	}
+	copl->l = CEND;
+
+	if (par->bplcon0 & BPC0_LACE) {
+		cops = copdisplay.rebuild[0];
+		p = par->bplpt0;
+		if (mod2(par->diwstrt_v))
+			p -= par->next_line;
+		else
+			p += par->next_line;
+		if (par->vmode & FB_VMODE_YWRAP) {
+			if ((par->vyres - par->yoffset) != 1 || mod2(par->diwstrt_v)) {
+				if (par->yoffset > par->vyres - par->yres + 1) {
+					for (i = 0; i < (short)par->bpp; i++, p += par->next_plane) {
+						(cops++)->l = CMOVE(highw(p), bplpt[i]);
+						(cops++)->l = CMOVE2(loww(p), bplpt[i]);
+					}
+					line = par->diwstrt_v + ((par->vyres - par->yoffset) << par->line_shift) - 2;
+					while (line >= 512) {
+						(cops++)->l = CWAIT(h_end1, 510);
+						line -= 512;
+					}
+					if (line > 510 && IS_AGA && maxfmode + par->clk_shift == 0)
+						(cops++)->l = CWAIT(h_end1, line);
+					else
+						(cops++)->l = CWAIT(h_end2, line);
+					p = par->bplpt0wrap;
+					if (mod2(par->diwstrt_v + par->vyres -
+					    par->yoffset))
+						p -= par->next_line;
+					else
+						p += par->next_line;
+				}
+			} else
+				p = par->bplpt0wrap - par->next_line;
+		}
+		for (i = 0; i < (short)par->bpp; i++, p += par->next_plane) {
+			(cops++)->l = CMOVE(highw(p), bplpt[i]);
+			(cops++)->l = CMOVE2(loww(p), bplpt[i]);
+		}
+		cops->l = CEND;
+	}
+}
+
+
+	/*
+	 * Build the Copper List
+	 */
+
+static void ami_build_copper(struct fb_info *info)
+{
+	struct amifb_par *par = info->par;
+	copins *copl, *cops;
+	u_long p;
+
+	currentcop = 1 - currentcop;
+
+	copl = copdisplay.list[currentcop][1];
+
+	(copl++)->l = CWAIT(0, 10);
+	(copl++)->l = CMOVE(par->bplcon0, bplcon0);
+	(copl++)->l = CMOVE(0, sprpt[0]);
+	(copl++)->l = CMOVE2(0, sprpt[0]);
+
+	if (par->bplcon0 & BPC0_LACE) {
+		cops = copdisplay.list[currentcop][0];
+
+		(cops++)->l = CWAIT(0, 10);
+		(cops++)->l = CMOVE(par->bplcon0, bplcon0);
+		(cops++)->l = CMOVE(0, sprpt[0]);
+		(cops++)->l = CMOVE2(0, sprpt[0]);
+
+		(copl++)->l = CMOVE(diwstrt2hw(par->diwstrt_h, par->diwstrt_v + 1), diwstrt);
+		(copl++)->l = CMOVE(diwstop2hw(par->diwstop_h, par->diwstop_v + 1), diwstop);
+		(cops++)->l = CMOVE(diwstrt2hw(par->diwstrt_h, par->diwstrt_v), diwstrt);
+		(cops++)->l = CMOVE(diwstop2hw(par->diwstop_h, par->diwstop_v), diwstop);
+		if (!IS_OCS) {
+			(copl++)->l = CMOVE(diwhigh2hw(par->diwstrt_h, par->diwstrt_v + 1,
+					    par->diwstop_h, par->diwstop_v + 1), diwhigh);
+			(cops++)->l = CMOVE(diwhigh2hw(par->diwstrt_h, par->diwstrt_v,
+					    par->diwstop_h, par->diwstop_v), diwhigh);
+#if 0
+			if (par->beamcon0 & BMC0_VARBEAMEN) {
+				(copl++)->l = CMOVE(vtotal2hw(par->vtotal), vtotal);
+				(copl++)->l = CMOVE(vbstrt2hw(par->vbstrt + 1), vbstrt);
+				(copl++)->l = CMOVE(vbstop2hw(par->vbstop + 1), vbstop);
+				(cops++)->l = CMOVE(vtotal2hw(par->vtotal), vtotal);
+				(cops++)->l = CMOVE(vbstrt2hw(par->vbstrt), vbstrt);
+				(cops++)->l = CMOVE(vbstop2hw(par->vbstop), vbstop);
+			}
+#endif
+		}
+		p = ZTWO_PADDR(copdisplay.list[currentcop][0]);
+		(copl++)->l = CMOVE(highw(p), cop2lc);
+		(copl++)->l = CMOVE2(loww(p), cop2lc);
+		p = ZTWO_PADDR(copdisplay.list[currentcop][1]);
+		(cops++)->l = CMOVE(highw(p), cop2lc);
+		(cops++)->l = CMOVE2(loww(p), cop2lc);
+		copdisplay.rebuild[0] = cops;
+	} else {
+		(copl++)->l = CMOVE(diwstrt2hw(par->diwstrt_h, par->diwstrt_v), diwstrt);
+		(copl++)->l = CMOVE(diwstop2hw(par->diwstop_h, par->diwstop_v), diwstop);
+		if (!IS_OCS) {
+			(copl++)->l = CMOVE(diwhigh2hw(par->diwstrt_h, par->diwstrt_v,
+					    par->diwstop_h, par->diwstop_v), diwhigh);
+#if 0
+			if (par->beamcon0 & BMC0_VARBEAMEN) {
+				(copl++)->l = CMOVE(vtotal2hw(par->vtotal), vtotal);
+				(copl++)->l = CMOVE(vbstrt2hw(par->vbstrt), vbstrt);
+				(copl++)->l = CMOVE(vbstop2hw(par->vbstop), vbstop);
+			}
+#endif
+		}
+	}
+	copdisplay.rebuild[1] = copl;
+
+	ami_update_par(info);
+	ami_rebuild_copper(info->par);
+}
+
+#ifndef MODULE
+static void __init amifb_setup_mcap(char *spec)
+{
+	char *p;
+	int vmin, vmax, hmin, hmax;
+
+	/* Format for monitor capabilities is: <Vmin>;<Vmax>;<Hmin>;<Hmax>
+	 * <V*> vertical freq. in Hz
+	 * <H*> horizontal freq. in kHz
+	 */
+
+	if (!(p = strsep(&spec, ";")) || !*p)
+		return;
+	vmin = simple_strtoul(p, NULL, 10);
+	if (vmin <= 0)
+		return;
+	if (!(p = strsep(&spec, ";")) || !*p)
+		return;
+	vmax = simple_strtoul(p, NULL, 10);
+	if (vmax <= 0 || vmax <= vmin)
+		return;
+	if (!(p = strsep(&spec, ";")) || !*p)
+		return;
+	hmin = 1000 * simple_strtoul(p, NULL, 10);
+	if (hmin <= 0)
+		return;
+	if (!(p = strsep(&spec, "")) || !*p)
+		return;
+	hmax = 1000 * simple_strtoul(p, NULL, 10);
+	if (hmax <= 0 || hmax <= hmin)
+		return;
+
+	amifb_hfmin = hmin;
+	amifb_hfmax = hmax;
+	amifb_vfmin = vmin;
+	amifb_vfmax = vmax;
+}
+
+static int __init amifb_setup(char *options)
+{
+	char *this_opt;
+
+	if (!options || !*options)
+		return 0;
+
+	while ((this_opt = strsep(&options, ",")) != NULL) {
+		if (!*this_opt)
+			continue;
+		if (!strcmp(this_opt, "inverse")) {
+			fb_invert_cmaps();
+		} else if (!strcmp(this_opt, "ilbm"))
+			amifb_ilbm = 1;
+		else if (!strncmp(this_opt, "monitorcap:", 11))
+			amifb_setup_mcap(this_opt + 11);
+		else if (!strncmp(this_opt, "fstart:", 7))
+			min_fstrt = simple_strtoul(this_opt + 7, NULL, 0);
+		else
+			mode_option = this_opt;
+	}
+
+	if (min_fstrt < 48)
+		min_fstrt = 48;
+
+	return 0;
+}
+#endif
+
+static int amifb_check_var(struct fb_var_screeninfo *var,
+			   struct fb_info *info)
+{
+	int err;
+	struct amifb_par par;
+
+	/* Validate wanted screen parameters */
+	err = ami_decode_var(var, &par, info);
+	if (err)
+		return err;
+
+	/* Encode (possibly rounded) screen parameters */
+	ami_encode_var(var, &par);
+	return 0;
+}
+
+
+static int amifb_set_par(struct fb_info *info)
+{
+	struct amifb_par *par = info->par;
+	int error;
+
+	do_vmode_pan = 0;
+	do_vmode_full = 0;
+
+	/* Decode wanted screen parameters */
+	error = ami_decode_var(&info->var, par, info);
+	if (error)
+		return error;
+
+	/* Set new videomode */
+	ami_build_copper(info);
+
+	/* Set VBlank trigger */
+	do_vmode_full = 1;
+
+	/* Update fix for new screen parameters */
+	if (par->bpp == 1) {
+		info->fix.type = FB_TYPE_PACKED_PIXELS;
+		info->fix.type_aux = 0;
+	} else if (amifb_ilbm) {
+		info->fix.type = FB_TYPE_INTERLEAVED_PLANES;
+		info->fix.type_aux = par->next_line;
+	} else {
+		info->fix.type = FB_TYPE_PLANES;
+		info->fix.type_aux = 0;
+	}
+	info->fix.line_length = div8(upx(16 << maxfmode, par->vxres));
+
+	if (par->vmode & FB_VMODE_YWRAP) {
+		info->fix.ywrapstep = 1;
+		info->fix.xpanstep = 0;
+		info->fix.ypanstep = 0;
+		info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YWRAP |
+			FBINFO_READS_FAST; /* override SCROLL_REDRAW */
+	} else {
+		info->fix.ywrapstep = 0;
+		if (par->vmode & FB_VMODE_SMOOTH_XPAN)
+			info->fix.xpanstep = 1;
+		else
+			info->fix.xpanstep = 16 << maxfmode;
+		info->fix.ypanstep = 1;
+		info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
+	}
+	return 0;
+}
+
+
+	/*
+	 * Set a single color register. The values supplied are already
+	 * rounded down to the hardware's capabilities (according to the
+	 * entries in the var structure). Return != 0 for invalid regno.
+	 */
+
+static int amifb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+			   u_int transp, struct fb_info *info)
+{
+	const struct amifb_par *par = info->par;
+
+	if (IS_AGA) {
+		if (regno > 255)
+			return 1;
+	} else if (par->bplcon0 & BPC0_SHRES) {
+		if (regno > 3)
+			return 1;
+	} else {
+		if (regno > 31)
+			return 1;
+	}
+	red >>= 8;
+	green >>= 8;
+	blue >>= 8;
+	if (!regno) {
+		red0 = red;
+		green0 = green;
+		blue0 = blue;
+	}
+
+	/*
+	 * Update the corresponding Hardware Color Register, unless it's Color
+	 * Register 0 and the screen is blanked.
+	 *
+	 * VBlank is switched off to protect bplcon3 or ecs_palette[] from
+	 * being changed by ami_do_blank() during the VBlank.
+	 */
+
+	if (regno || !is_blanked) {
+#if defined(CONFIG_FB_AMIGA_AGA)
+		if (IS_AGA) {
+			u_short bplcon3 = par->bplcon3;
+			VBlankOff();
+			custom.bplcon3 = bplcon3 | (regno << 8 & 0xe000);
+			custom.color[regno & 31] = rgb2hw8_high(red, green,
+								blue);
+			custom.bplcon3 = bplcon3 | (regno << 8 & 0xe000) |
+					 BPC3_LOCT;
+			custom.color[regno & 31] = rgb2hw8_low(red, green,
+							       blue);
+			custom.bplcon3 = bplcon3;
+			VBlankOn();
+		} else
+#endif
+#if defined(CONFIG_FB_AMIGA_ECS)
+		if (par->bplcon0 & BPC0_SHRES) {
+			u_short color, mask;
+			int i;
+
+			mask = 0x3333;
+			color = rgb2hw2(red, green, blue);
+			VBlankOff();
+			for (i = regno + 12; i >= (int)regno; i -= 4)
+				custom.color[i] = ecs_palette[i] = (ecs_palette[i] & mask) | color;
+			mask <<= 2; color >>= 2;
+			regno = down16(regno) + mul4(mod4(regno));
+			for (i = regno + 3; i >= (int)regno; i--)
+				custom.color[i] = ecs_palette[i] = (ecs_palette[i] & mask) | color;
+			VBlankOn();
+		} else
+#endif
+			custom.color[regno] = rgb2hw4(red, green, blue);
+	}
+	return 0;
+}
+
+
+	/*
+	 * Blank the display.
+	 */
+
+static int amifb_blank(int blank, struct fb_info *info)
+{
+	do_blank = blank ? blank : -1;
+
+	return 0;
+}
+
+
+	/*
+	 * Pan or Wrap the Display
+	 *
+	 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag
+	 */
+
+static int amifb_pan_display(struct fb_var_screeninfo *var,
+			     struct fb_info *info)
+{
+	if (var->vmode & FB_VMODE_YWRAP) {
+		if (var->yoffset < 0 ||
+			var->yoffset >= info->var.yres_virtual || var->xoffset)
+				return -EINVAL;
+	} else {
+		/*
+		 * TODO: There will be problems when xpan!=1, so some columns
+		 * on the right side will never be seen
+		 */
+		if (var->xoffset + info->var.xres >
+		    upx(16 << maxfmode, info->var.xres_virtual) ||
+		    var->yoffset + info->var.yres > info->var.yres_virtual)
+			return -EINVAL;
+	}
+	ami_pan_var(var, info);
+	info->var.xoffset = var->xoffset;
+	info->var.yoffset = var->yoffset;
+	if (var->vmode & FB_VMODE_YWRAP)
+		info->var.vmode |= FB_VMODE_YWRAP;
+	else
+		info->var.vmode &= ~FB_VMODE_YWRAP;
+	return 0;
+}
+
+
+#if BITS_PER_LONG == 32
+#define BYTES_PER_LONG	4
+#define SHIFT_PER_LONG	5
+#elif BITS_PER_LONG == 64
+#define BYTES_PER_LONG	8
+#define SHIFT_PER_LONG	6
+#else
+#define Please update me
+#endif
+
+
+	/*
+	 *  Compose two values, using a bitmask as decision value
+	 *  This is equivalent to (a & mask) | (b & ~mask)
+	 */
+
+static inline unsigned long comp(unsigned long a, unsigned long b,
+				 unsigned long mask)
+{
+	return ((a ^ b) & mask) ^ b;
+}
+
+
+static inline unsigned long xor(unsigned long a, unsigned long b,
+				unsigned long mask)
+{
+	return (a & mask) ^ b;
+}
+
+
+	/*
+	 *  Unaligned forward bit copy using 32-bit or 64-bit memory accesses
+	 */
+
+static void bitcpy(unsigned long *dst, int dst_idx, const unsigned long *src,
+		   int src_idx, u32 n)
+{
+	unsigned long first, last;
+	int shift = dst_idx - src_idx, left, right;
+	unsigned long d0, d1;
+	int m;
+
+	if (!n)
+		return;
+
+	shift = dst_idx - src_idx;
+	first = ~0UL >> dst_idx;
+	last = ~(~0UL >> ((dst_idx + n) % BITS_PER_LONG));
+
+	if (!shift) {
+		// Same alignment for source and dest
+
+		if (dst_idx + n <= BITS_PER_LONG) {
+			// Single word
+			if (last)
+				first &= last;
+			*dst = comp(*src, *dst, first);
+		} else {
+			// Multiple destination words
+			// Leading bits
+			if (first) {
+				*dst = comp(*src, *dst, first);
+				dst++;
+				src++;
+				n -= BITS_PER_LONG - dst_idx;
+			}
+
+			// Main chunk
+			n /= BITS_PER_LONG;
+			while (n >= 8) {
+				*dst++ = *src++;
+				*dst++ = *src++;
+				*dst++ = *src++;
+				*dst++ = *src++;
+				*dst++ = *src++;
+				*dst++ = *src++;
+				*dst++ = *src++;
+				*dst++ = *src++;
+				n -= 8;
+			}
+			while (n--)
+				*dst++ = *src++;
+
+			// Trailing bits
+			if (last)
+				*dst = comp(*src, *dst, last);
+		}
+	} else {
+		// Different alignment for source and dest
+
+		right = shift & (BITS_PER_LONG - 1);
+		left = -shift & (BITS_PER_LONG - 1);
+
+		if (dst_idx + n <= BITS_PER_LONG) {
+			// Single destination word
+			if (last)
+				first &= last;
+			if (shift > 0) {
+				// Single source word
+				*dst = comp(*src >> right, *dst, first);
+			} else if (src_idx + n <= BITS_PER_LONG) {
+				// Single source word
+				*dst = comp(*src << left, *dst, first);
+			} else {
+				// 2 source words
+				d0 = *src++;
+				d1 = *src;
+				*dst = comp(d0 << left | d1 >> right, *dst,
+					    first);
+			}
+		} else {
+			// Multiple destination words
+			d0 = *src++;
+			// Leading bits
+			if (shift > 0) {
+				// Single source word
+				*dst = comp(d0 >> right, *dst, first);
+				dst++;
+				n -= BITS_PER_LONG - dst_idx;
+			} else {
+				// 2 source words
+				d1 = *src++;
+				*dst = comp(d0 << left | d1 >> right, *dst,
+					    first);
+				d0 = d1;
+				dst++;
+				n -= BITS_PER_LONG - dst_idx;
+			}
+
+			// Main chunk
+			m = n % BITS_PER_LONG;
+			n /= BITS_PER_LONG;
+			while (n >= 4) {
+				d1 = *src++;
+				*dst++ = d0 << left | d1 >> right;
+				d0 = d1;
+				d1 = *src++;
+				*dst++ = d0 << left | d1 >> right;
+				d0 = d1;
+				d1 = *src++;
+				*dst++ = d0 << left | d1 >> right;
+				d0 = d1;
+				d1 = *src++;
+				*dst++ = d0 << left | d1 >> right;
+				d0 = d1;
+				n -= 4;
+			}
+			while (n--) {
+				d1 = *src++;
+				*dst++ = d0 << left | d1 >> right;
+				d0 = d1;
+			}
+
+			// Trailing bits
+			if (last) {
+				if (m <= right) {
+					// Single source word
+					*dst = comp(d0 << left, *dst, last);
+				} else {
+					// 2 source words
+					d1 = *src;
+					*dst = comp(d0 << left | d1 >> right,
+						    *dst, last);
+				}
+			}
+		}
+	}
+}
+
+
+	/*
+	 *  Unaligned reverse bit copy using 32-bit or 64-bit memory accesses
+	 */
+
+static void bitcpy_rev(unsigned long *dst, int dst_idx,
+		       const unsigned long *src, int src_idx, u32 n)
+{
+	unsigned long first, last;
+	int shift = dst_idx - src_idx, left, right;
+	unsigned long d0, d1;
+	int m;
+
+	if (!n)
+		return;
+
+	dst += (n - 1) / BITS_PER_LONG;
+	src += (n - 1) / BITS_PER_LONG;
+	if ((n - 1) % BITS_PER_LONG) {
+		dst_idx += (n - 1) % BITS_PER_LONG;
+		dst += dst_idx >> SHIFT_PER_LONG;
+		dst_idx &= BITS_PER_LONG - 1;
+		src_idx += (n - 1) % BITS_PER_LONG;
+		src += src_idx >> SHIFT_PER_LONG;
+		src_idx &= BITS_PER_LONG - 1;
+	}
+
+	shift = dst_idx - src_idx;
+	first = ~0UL << (BITS_PER_LONG - 1 - dst_idx);
+	last = ~(~0UL << (BITS_PER_LONG - 1 - ((dst_idx - n) % BITS_PER_LONG)));
+
+	if (!shift) {
+		// Same alignment for source and dest
+
+		if ((unsigned long)dst_idx + 1 >= n) {
+			// Single word
+			if (last)
+				first &= last;
+			*dst = comp(*src, *dst, first);
+		} else {
+			// Multiple destination words
+			// Leading bits
+			if (first) {
+				*dst = comp(*src, *dst, first);
+				dst--;
+				src--;
+				n -= dst_idx + 1;
+			}
+
+			// Main chunk
+			n /= BITS_PER_LONG;
+			while (n >= 8) {
+				*dst-- = *src--;
+				*dst-- = *src--;
+				*dst-- = *src--;
+				*dst-- = *src--;
+				*dst-- = *src--;
+				*dst-- = *src--;
+				*dst-- = *src--;
+				*dst-- = *src--;
+				n -= 8;
+			}
+			while (n--)
+				*dst-- = *src--;
+
+			// Trailing bits
+			if (last)
+				*dst = comp(*src, *dst, last);
+		}
+	} else {
+		// Different alignment for source and dest
+
+		right = shift & (BITS_PER_LONG - 1);
+		left = -shift & (BITS_PER_LONG - 1);
+
+		if ((unsigned long)dst_idx + 1 >= n) {
+			// Single destination word
+			if (last)
+				first &= last;
+			if (shift < 0) {
+				// Single source word
+				*dst = comp(*src << left, *dst, first);
+			} else if (1 + (unsigned long)src_idx >= n) {
+				// Single source word
+				*dst = comp(*src >> right, *dst, first);
+			} else {
+				// 2 source words
+				d0 = *src--;
+				d1 = *src;
+				*dst = comp(d0 >> right | d1 << left, *dst,
+					    first);
+			}
+		} else {
+			// Multiple destination words
+			d0 = *src--;
+			// Leading bits
+			if (shift < 0) {
+				// Single source word
+				*dst = comp(d0 << left, *dst, first);
+				dst--;
+				n -= dst_idx + 1;
+			} else {
+				// 2 source words
+				d1 = *src--;
+				*dst = comp(d0 >> right | d1 << left, *dst,
+					    first);
+				d0 = d1;
+				dst--;
+				n -= dst_idx + 1;
+			}
+
+			// Main chunk
+			m = n % BITS_PER_LONG;
+			n /= BITS_PER_LONG;
+			while (n >= 4) {
+				d1 = *src--;
+				*dst-- = d0 >> right | d1 << left;
+				d0 = d1;
+				d1 = *src--;
+				*dst-- = d0 >> right | d1 << left;
+				d0 = d1;
+				d1 = *src--;
+				*dst-- = d0 >> right | d1 << left;
+				d0 = d1;
+				d1 = *src--;
+				*dst-- = d0 >> right | d1 << left;
+				d0 = d1;
+				n -= 4;
+			}
+			while (n--) {
+				d1 = *src--;
+				*dst-- = d0 >> right | d1 << left;
+				d0 = d1;
+			}
+
+			// Trailing bits
+			if (last) {
+				if (m <= left) {
+					// Single source word
+					*dst = comp(d0 >> right, *dst, last);
+				} else {
+					// 2 source words
+					d1 = *src;
+					*dst = comp(d0 >> right | d1 << left,
+						    *dst, last);
+				}
+			}
+		}
+	}
+}
+
+
+	/*
+	 *  Unaligned forward inverting bit copy using 32-bit or 64-bit memory
+	 *  accesses
+	 */
+
+static void bitcpy_not(unsigned long *dst, int dst_idx,
+		       const unsigned long *src, int src_idx, u32 n)
+{
+	unsigned long first, last;
+	int shift = dst_idx - src_idx, left, right;
+	unsigned long d0, d1;
+	int m;
+
+	if (!n)
+		return;
+
+	shift = dst_idx - src_idx;
+	first = ~0UL >> dst_idx;
+	last = ~(~0UL >> ((dst_idx + n) % BITS_PER_LONG));
+
+	if (!shift) {
+		// Same alignment for source and dest
+
+		if (dst_idx + n <= BITS_PER_LONG) {
+			// Single word
+			if (last)
+				first &= last;
+			*dst = comp(~*src, *dst, first);
+		} else {
+			// Multiple destination words
+			// Leading bits
+			if (first) {
+				*dst = comp(~*src, *dst, first);
+				dst++;
+				src++;
+				n -= BITS_PER_LONG - dst_idx;
+			}
+
+			// Main chunk
+			n /= BITS_PER_LONG;
+			while (n >= 8) {
+				*dst++ = ~*src++;
+				*dst++ = ~*src++;
+				*dst++ = ~*src++;
+				*dst++ = ~*src++;
+				*dst++ = ~*src++;
+				*dst++ = ~*src++;
+				*dst++ = ~*src++;
+				*dst++ = ~*src++;
+				n -= 8;
+			}
+			while (n--)
+				*dst++ = ~*src++;
+
+			// Trailing bits
+			if (last)
+				*dst = comp(~*src, *dst, last);
+		}
+	} else {
+		// Different alignment for source and dest
+
+		right = shift & (BITS_PER_LONG - 1);
+		left = -shift & (BITS_PER_LONG - 1);
+
+		if (dst_idx + n <= BITS_PER_LONG) {
+			// Single destination word
+			if (last)
+				first &= last;
+			if (shift > 0) {
+				// Single source word
+				*dst = comp(~*src >> right, *dst, first);
+			} else if (src_idx + n <= BITS_PER_LONG) {
+				// Single source word
+				*dst = comp(~*src << left, *dst, first);
+			} else {
+				// 2 source words
+				d0 = ~*src++;
+				d1 = ~*src;
+				*dst = comp(d0 << left | d1 >> right, *dst,
+					    first);
+			}
+		} else {
+			// Multiple destination words
+			d0 = ~*src++;
+			// Leading bits
+			if (shift > 0) {
+				// Single source word
+				*dst = comp(d0 >> right, *dst, first);
+				dst++;
+				n -= BITS_PER_LONG - dst_idx;
+			} else {
+				// 2 source words
+				d1 = ~*src++;
+				*dst = comp(d0 << left | d1 >> right, *dst,
+					    first);
+				d0 = d1;
+				dst++;
+				n -= BITS_PER_LONG - dst_idx;
+			}
+
+			// Main chunk
+			m = n % BITS_PER_LONG;
+			n /= BITS_PER_LONG;
+			while (n >= 4) {
+				d1 = ~*src++;
+				*dst++ = d0 << left | d1 >> right;
+				d0 = d1;
+				d1 = ~*src++;
+				*dst++ = d0 << left | d1 >> right;
+				d0 = d1;
+				d1 = ~*src++;
+				*dst++ = d0 << left | d1 >> right;
+				d0 = d1;
+				d1 = ~*src++;
+				*dst++ = d0 << left | d1 >> right;
+				d0 = d1;
+				n -= 4;
+			}
+			while (n--) {
+				d1 = ~*src++;
+				*dst++ = d0 << left | d1 >> right;
+				d0 = d1;
+			}
+
+			// Trailing bits
+			if (last) {
+				if (m <= right) {
+					// Single source word
+					*dst = comp(d0 << left, *dst, last);
+				} else {
+					// 2 source words
+					d1 = ~*src;
+					*dst = comp(d0 << left | d1 >> right,
+						    *dst, last);
+				}
+			}
+		}
+	}
+}
+
+
+	/*
+	 *  Unaligned 32-bit pattern fill using 32/64-bit memory accesses
+	 */
+
+static void bitfill32(unsigned long *dst, int dst_idx, u32 pat, u32 n)
+{
+	unsigned long val = pat;
+	unsigned long first, last;
+
+	if (!n)
+		return;
+
+#if BITS_PER_LONG == 64
+	val |= val << 32;
+#endif
+
+	first = ~0UL >> dst_idx;
+	last = ~(~0UL >> ((dst_idx + n) % BITS_PER_LONG));
+
+	if (dst_idx + n <= BITS_PER_LONG) {
+		// Single word
+		if (last)
+			first &= last;
+		*dst = comp(val, *dst, first);
+	} else {
+		// Multiple destination words
+		// Leading bits
+		if (first) {
+			*dst = comp(val, *dst, first);
+			dst++;
+			n -= BITS_PER_LONG - dst_idx;
+		}
+
+		// Main chunk
+		n /= BITS_PER_LONG;
+		while (n >= 8) {
+			*dst++ = val;
+			*dst++ = val;
+			*dst++ = val;
+			*dst++ = val;
+			*dst++ = val;
+			*dst++ = val;
+			*dst++ = val;
+			*dst++ = val;
+			n -= 8;
+		}
+		while (n--)
+			*dst++ = val;
+
+		// Trailing bits
+		if (last)
+			*dst = comp(val, *dst, last);
+	}
+}
+
+
+	/*
+	 *  Unaligned 32-bit pattern xor using 32/64-bit memory accesses
+	 */
+
+static void bitxor32(unsigned long *dst, int dst_idx, u32 pat, u32 n)
+{
+	unsigned long val = pat;
+	unsigned long first, last;
+
+	if (!n)
+		return;
+
+#if BITS_PER_LONG == 64
+	val |= val << 32;
+#endif
+
+	first = ~0UL >> dst_idx;
+	last = ~(~0UL >> ((dst_idx + n) % BITS_PER_LONG));
+
+	if (dst_idx + n <= BITS_PER_LONG) {
+		// Single word
+		if (last)
+			first &= last;
+		*dst = xor(val, *dst, first);
+	} else {
+		// Multiple destination words
+		// Leading bits
+		if (first) {
+			*dst = xor(val, *dst, first);
+			dst++;
+			n -= BITS_PER_LONG - dst_idx;
+		}
+
+		// Main chunk
+		n /= BITS_PER_LONG;
+		while (n >= 4) {
+			*dst++ ^= val;
+			*dst++ ^= val;
+			*dst++ ^= val;
+			*dst++ ^= val;
+			n -= 4;
+		}
+		while (n--)
+			*dst++ ^= val;
+
+		// Trailing bits
+		if (last)
+			*dst = xor(val, *dst, last);
+	}
+}
+
+static inline void fill_one_line(int bpp, unsigned long next_plane,
+				 unsigned long *dst, int dst_idx, u32 n,
+				 u32 color)
+{
+	while (1) {
+		dst += dst_idx >> SHIFT_PER_LONG;
+		dst_idx &= (BITS_PER_LONG - 1);
+		bitfill32(dst, dst_idx, color & 1 ? ~0 : 0, n);
+		if (!--bpp)
+			break;
+		color >>= 1;
+		dst_idx += next_plane * 8;
+	}
+}
+
+static inline void xor_one_line(int bpp, unsigned long next_plane,
+				unsigned long *dst, int dst_idx, u32 n,
+				u32 color)
+{
+	while (color) {
+		dst += dst_idx >> SHIFT_PER_LONG;
+		dst_idx &= (BITS_PER_LONG - 1);
+		bitxor32(dst, dst_idx, color & 1 ? ~0 : 0, n);
+		if (!--bpp)
+			break;
+		color >>= 1;
+		dst_idx += next_plane * 8;
+	}
+}
+
+
+static void amifb_fillrect(struct fb_info *info,
+			   const struct fb_fillrect *rect)
+{
+	struct amifb_par *par = info->par;
+	int dst_idx, x2, y2;
+	unsigned long *dst;
+	u32 width, height;
+
+	if (!rect->width || !rect->height)
+		return;
+
+	/*
+	 * We could use hardware clipping but on many cards you get around
+	 * hardware clipping by writing to framebuffer directly.
+	 * */
+	x2 = rect->dx + rect->width;
+	y2 = rect->dy + rect->height;
+	x2 = x2 < info->var.xres_virtual ? x2 : info->var.xres_virtual;
+	y2 = y2 < info->var.yres_virtual ? y2 : info->var.yres_virtual;
+	width = x2 - rect->dx;
+	height = y2 - rect->dy;
+
+	dst = (unsigned long *)
+		((unsigned long)info->screen_base & ~(BYTES_PER_LONG - 1));
+	dst_idx = ((unsigned long)info->screen_base & (BYTES_PER_LONG - 1)) * 8;
+	dst_idx += rect->dy * par->next_line * 8 + rect->dx;
+	while (height--) {
+		switch (rect->rop) {
+		case ROP_COPY:
+			fill_one_line(info->var.bits_per_pixel,
+				      par->next_plane, dst, dst_idx, width,
+				      rect->color);
+			break;
+
+		case ROP_XOR:
+			xor_one_line(info->var.bits_per_pixel, par->next_plane,
+				     dst, dst_idx, width, rect->color);
+			break;
+		}
+		dst_idx += par->next_line * 8;
+	}
+}
+
+static inline void copy_one_line(int bpp, unsigned long next_plane,
+				 unsigned long *dst, int dst_idx,
+				 unsigned long *src, int src_idx, u32 n)
+{
+	while (1) {
+		dst += dst_idx >> SHIFT_PER_LONG;
+		dst_idx &= (BITS_PER_LONG - 1);
+		src += src_idx >> SHIFT_PER_LONG;
+		src_idx &= (BITS_PER_LONG - 1);
+		bitcpy(dst, dst_idx, src, src_idx, n);
+		if (!--bpp)
+			break;
+		dst_idx += next_plane * 8;
+		src_idx += next_plane * 8;
+	}
+}
+
+static inline void copy_one_line_rev(int bpp, unsigned long next_plane,
+				     unsigned long *dst, int dst_idx,
+				     unsigned long *src, int src_idx, u32 n)
+{
+	while (1) {
+		dst += dst_idx >> SHIFT_PER_LONG;
+		dst_idx &= (BITS_PER_LONG - 1);
+		src += src_idx >> SHIFT_PER_LONG;
+		src_idx &= (BITS_PER_LONG - 1);
+		bitcpy_rev(dst, dst_idx, src, src_idx, n);
+		if (!--bpp)
+			break;
+		dst_idx += next_plane * 8;
+		src_idx += next_plane * 8;
+	}
+}
+
+
+static void amifb_copyarea(struct fb_info *info,
+			   const struct fb_copyarea *area)
+{
+	struct amifb_par *par = info->par;
+	int x2, y2;
+	u32 dx, dy, sx, sy, width, height;
+	unsigned long *dst, *src;
+	int dst_idx, src_idx;
+	int rev_copy = 0;
+
+	/* clip the destination */
+	x2 = area->dx + area->width;
+	y2 = area->dy + area->height;
+	dx = area->dx > 0 ? area->dx : 0;
+	dy = area->dy > 0 ? area->dy : 0;
+	x2 = x2 < info->var.xres_virtual ? x2 : info->var.xres_virtual;
+	y2 = y2 < info->var.yres_virtual ? y2 : info->var.yres_virtual;
+	width = x2 - dx;
+	height = y2 - dy;
+
+	if (area->sx + dx < area->dx || area->sy + dy < area->dy)
+		return;
+
+	/* update sx,sy */
+	sx = area->sx + (dx - area->dx);
+	sy = area->sy + (dy - area->dy);
+
+	/* the source must be completely inside the virtual screen */
+	if (sx + width > info->var.xres_virtual ||
+			sy + height > info->var.yres_virtual)
+		return;
+
+	if (dy > sy || (dy == sy && dx > sx)) {
+		dy += height;
+		sy += height;
+		rev_copy = 1;
+	}
+	dst = (unsigned long *)
+		((unsigned long)info->screen_base & ~(BYTES_PER_LONG - 1));
+	src = dst;
+	dst_idx = ((unsigned long)info->screen_base & (BYTES_PER_LONG - 1)) * 8;
+	src_idx = dst_idx;
+	dst_idx += dy * par->next_line * 8 + dx;
+	src_idx += sy * par->next_line * 8 + sx;
+	if (rev_copy) {
+		while (height--) {
+			dst_idx -= par->next_line * 8;
+			src_idx -= par->next_line * 8;
+			copy_one_line_rev(info->var.bits_per_pixel,
+					  par->next_plane, dst, dst_idx, src,
+					  src_idx, width);
+		}
+	} else {
+		while (height--) {
+			copy_one_line(info->var.bits_per_pixel,
+				      par->next_plane, dst, dst_idx, src,
+				      src_idx, width);
+			dst_idx += par->next_line * 8;
+			src_idx += par->next_line * 8;
+		}
+	}
+}
+
+
+static inline void expand_one_line(int bpp, unsigned long next_plane,
+				   unsigned long *dst, int dst_idx, u32 n,
+				   const u8 *data, u32 bgcolor, u32 fgcolor)
+{
+	const unsigned long *src;
+	int src_idx;
+
+	while (1) {
+		dst += dst_idx >> SHIFT_PER_LONG;
+		dst_idx &= (BITS_PER_LONG - 1);
+		if ((bgcolor ^ fgcolor) & 1) {
+			src = (unsigned long *)
+				((unsigned long)data & ~(BYTES_PER_LONG - 1));
+			src_idx = ((unsigned long)data & (BYTES_PER_LONG - 1)) * 8;
+			if (fgcolor & 1)
+				bitcpy(dst, dst_idx, src, src_idx, n);
+			else
+				bitcpy_not(dst, dst_idx, src, src_idx, n);
+			/* set or clear */
+		} else
+			bitfill32(dst, dst_idx, fgcolor & 1 ? ~0 : 0, n);
+		if (!--bpp)
+			break;
+		bgcolor >>= 1;
+		fgcolor >>= 1;
+		dst_idx += next_plane * 8;
+	}
+}
+
+
+static void amifb_imageblit(struct fb_info *info, const struct fb_image *image)
+{
+	struct amifb_par *par = info->par;
+	int x2, y2;
+	unsigned long *dst;
+	int dst_idx;
+	const char *src;
+	u32 dx, dy, width, height, pitch;
+
+	/*
+	 * We could use hardware clipping but on many cards you get around
+	 * hardware clipping by writing to framebuffer directly like we are
+	 * doing here.
+	 */
+	x2 = image->dx + image->width;
+	y2 = image->dy + image->height;
+	dx = image->dx;
+	dy = image->dy;
+	x2 = x2 < info->var.xres_virtual ? x2 : info->var.xres_virtual;
+	y2 = y2 < info->var.yres_virtual ? y2 : info->var.yres_virtual;
+	width  = x2 - dx;
+	height = y2 - dy;
+
+	if (image->depth == 1) {
+		dst = (unsigned long *)
+			((unsigned long)info->screen_base & ~(BYTES_PER_LONG - 1));
+		dst_idx = ((unsigned long)info->screen_base & (BYTES_PER_LONG - 1)) * 8;
+		dst_idx += dy * par->next_line * 8 + dx;
+		src = image->data;
+		pitch = (image->width + 7) / 8;
+		while (height--) {
+			expand_one_line(info->var.bits_per_pixel,
+					par->next_plane, dst, dst_idx, width,
+					src, image->bg_color,
+					image->fg_color);
+			dst_idx += par->next_line * 8;
+			src += pitch;
+		}
+	} else {
+		c2p_planar(info->screen_base, image->data, dx, dy, width,
+			   height, par->next_line, par->next_plane,
+			   image->width, info->var.bits_per_pixel);
+	}
+}
+
+
+	/*
+	 * Amiga Frame Buffer Specific ioctls
+	 */
+
+static int amifb_ioctl(struct fb_info *info,
+		       unsigned int cmd, unsigned long arg)
+{
+	union {
+		struct fb_fix_cursorinfo fix;
+		struct fb_var_cursorinfo var;
+		struct fb_cursorstate state;
+	} crsr;
+	void __user *argp = (void __user *)arg;
+	int i;
+
+	switch (cmd) {
+	case FBIOGET_FCURSORINFO:
+		i = ami_get_fix_cursorinfo(&crsr.fix, info->par);
+		if (i)
+			return i;
+		return copy_to_user(argp, &crsr.fix,
+				    sizeof(crsr.fix)) ? -EFAULT : 0;
+
+	case FBIOGET_VCURSORINFO:
+		i = ami_get_var_cursorinfo(&crsr.var,
+			((struct fb_var_cursorinfo __user *)arg)->data,
+			info->par);
+		if (i)
+			return i;
+		return copy_to_user(argp, &crsr.var,
+				    sizeof(crsr.var)) ? -EFAULT : 0;
+
+	case FBIOPUT_VCURSORINFO:
+		if (copy_from_user(&crsr.var, argp, sizeof(crsr.var)))
+			return -EFAULT;
+		return ami_set_var_cursorinfo(&crsr.var,
+			((struct fb_var_cursorinfo __user *)arg)->data,
+			info->par);
+
+	case FBIOGET_CURSORSTATE:
+		i = ami_get_cursorstate(&crsr.state, info->par);
+		if (i)
+			return i;
+		return copy_to_user(argp, &crsr.state,
+				    sizeof(crsr.state)) ? -EFAULT : 0;
+
+	case FBIOPUT_CURSORSTATE:
+		if (copy_from_user(&crsr.state, argp, sizeof(crsr.state)))
+			return -EFAULT;
+		return ami_set_cursorstate(&crsr.state, info->par);
+	}
+	return -EINVAL;
+}
+
+
+	/*
+	 * Flash the cursor (called by VBlank interrupt)
+	 */
+
+static int flash_cursor(void)
+{
+	static int cursorcount = 1;
+
+	if (cursormode == FB_CURSOR_FLASH) {
+		if (!--cursorcount) {
+			cursorstate = -cursorstate;
+			cursorcount = cursorrate;
+			if (!is_blanked)
+				return 1;
+		}
+	}
+	return 0;
+}
+
+	/*
+	 * VBlank Display Interrupt
+	 */
+
+static irqreturn_t amifb_interrupt(int irq, void *dev_id)
+{
+	struct amifb_par *par = dev_id;
+
+	if (do_vmode_pan || do_vmode_full)
+		ami_update_display(par);
+
+	if (do_vmode_full)
+		ami_init_display(par);
+
+	if (do_vmode_pan) {
+		flash_cursor();
+		ami_rebuild_copper(par);
+		do_cursor = do_vmode_pan = 0;
+	} else if (do_cursor) {
+		flash_cursor();
+		ami_set_sprite(par);
+		do_cursor = 0;
+	} else {
+		if (flash_cursor())
+			ami_set_sprite(par);
+	}
+
+	if (do_blank) {
+		ami_do_blank(par);
+		do_blank = 0;
+	}
+
+	if (do_vmode_full) {
+		ami_reinit_copper(par);
+		do_vmode_full = 0;
+	}
+	return IRQ_HANDLED;
+}
+
+
+static const struct fb_ops amifb_ops = {
+	.owner		= THIS_MODULE,
+	.fb_check_var	= amifb_check_var,
+	.fb_set_par	= amifb_set_par,
+	.fb_setcolreg	= amifb_setcolreg,
+	.fb_blank	= amifb_blank,
+	.fb_pan_display	= amifb_pan_display,
+	.fb_fillrect	= amifb_fillrect,
+	.fb_copyarea	= amifb_copyarea,
+	.fb_imageblit	= amifb_imageblit,
+	.fb_ioctl	= amifb_ioctl,
+};
+
+
+	/*
+	 * Allocate, Clear and Align a Block of Chip Memory
+	 */
+
+static void *aligned_chipptr;
+
+static inline u_long __init chipalloc(u_long size)
+{
+	aligned_chipptr = amiga_chip_alloc(size, "amifb [RAM]");
+	if (!aligned_chipptr) {
+		pr_err("amifb: No Chip RAM for frame buffer");
+		return 0;
+	}
+	memset(aligned_chipptr, 0, size);
+	return (u_long)aligned_chipptr;
+}
+
+static inline void chipfree(void)
+{
+	if (aligned_chipptr)
+		amiga_chip_free(aligned_chipptr);
+}
+
+
+	/*
+	 * Initialisation
+	 */
+
+static int __init amifb_probe(struct platform_device *pdev)
+{
+	struct fb_info *info;
+	int tag, i, err = 0;
+	u_long chipptr;
+	u_int defmode;
+
+#ifndef MODULE
+	char *option = NULL;
+
+	if (fb_get_options("amifb", &option)) {
+		amifb_video_off();
+		return -ENODEV;
+	}
+	amifb_setup(option);
+#endif
+	custom.dmacon = DMAF_ALL | DMAF_MASTER;
+
+	info = framebuffer_alloc(sizeof(struct amifb_par), &pdev->dev);
+	if (!info)
+		return -ENOMEM;
+
+	strcpy(info->fix.id, "Amiga ");
+	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+	info->fix.accel = FB_ACCEL_AMIGABLITT;
+
+	switch (amiga_chipset) {
+#ifdef CONFIG_FB_AMIGA_OCS
+	case CS_OCS:
+		strcat(info->fix.id, "OCS");
+default_chipset:
+		chipset = TAG_OCS;
+		maxdepth[TAG_SHRES] = 0;	/* OCS means no SHRES */
+		maxdepth[TAG_HIRES] = 4;
+		maxdepth[TAG_LORES] = 6;
+		maxfmode = TAG_FMODE_1;
+		defmode = amiga_vblank == 50 ? DEFMODE_PAL : DEFMODE_NTSC;
+		info->fix.smem_len = VIDEOMEMSIZE_OCS;
+		break;
+#endif /* CONFIG_FB_AMIGA_OCS */
+
+#ifdef CONFIG_FB_AMIGA_ECS
+	case CS_ECS:
+		strcat(info->fix.id, "ECS");
+		chipset = TAG_ECS;
+		maxdepth[TAG_SHRES] = 2;
+		maxdepth[TAG_HIRES] = 4;
+		maxdepth[TAG_LORES] = 6;
+		maxfmode = TAG_FMODE_1;
+		if (AMIGAHW_PRESENT(AMBER_FF))
+			defmode = amiga_vblank == 50 ? DEFMODE_AMBER_PAL
+						     : DEFMODE_AMBER_NTSC;
+		else
+			defmode = amiga_vblank == 50 ? DEFMODE_PAL
+						     : DEFMODE_NTSC;
+		if (amiga_chip_avail() - CHIPRAM_SAFETY_LIMIT >
+		    VIDEOMEMSIZE_ECS_2M)
+			info->fix.smem_len = VIDEOMEMSIZE_ECS_2M;
+		else
+			info->fix.smem_len = VIDEOMEMSIZE_ECS_1M;
+		break;
+#endif /* CONFIG_FB_AMIGA_ECS */
+
+#ifdef CONFIG_FB_AMIGA_AGA
+	case CS_AGA:
+		strcat(info->fix.id, "AGA");
+		chipset = TAG_AGA;
+		maxdepth[TAG_SHRES] = 8;
+		maxdepth[TAG_HIRES] = 8;
+		maxdepth[TAG_LORES] = 8;
+		maxfmode = TAG_FMODE_4;
+		defmode = DEFMODE_AGA;
+		if (amiga_chip_avail() - CHIPRAM_SAFETY_LIMIT >
+		    VIDEOMEMSIZE_AGA_2M)
+			info->fix.smem_len = VIDEOMEMSIZE_AGA_2M;
+		else
+			info->fix.smem_len = VIDEOMEMSIZE_AGA_1M;
+		break;
+#endif /* CONFIG_FB_AMIGA_AGA */
+
+	default:
+#ifdef CONFIG_FB_AMIGA_OCS
+		printk("Unknown graphics chipset, defaulting to OCS\n");
+		strcat(info->fix.id, "Unknown");
+		goto default_chipset;
+#else /* CONFIG_FB_AMIGA_OCS */
+		err = -ENODEV;
+		goto release;
+#endif /* CONFIG_FB_AMIGA_OCS */
+		break;
+	}
+
+	/*
+	 * Calculate the Pixel Clock Values for this Machine
+	 */
+
+	{
+	u_long tmp = DIVUL(200000000000ULL, amiga_eclock);
+
+	pixclock[TAG_SHRES] = (tmp + 4) / 8;	/* SHRES:  35 ns / 28 MHz */
+	pixclock[TAG_HIRES] = (tmp + 2) / 4;	/* HIRES:  70 ns / 14 MHz */
+	pixclock[TAG_LORES] = (tmp + 1) / 2;	/* LORES: 140 ns /  7 MHz */
+	}
+
+	/*
+	 * Replace the Tag Values with the Real Pixel Clock Values
+	 */
+
+	for (i = 0; i < NUM_TOTAL_MODES; i++) {
+		struct fb_videomode *mode = &ami_modedb[i];
+		tag = mode->pixclock;
+		if (tag == TAG_SHRES || tag == TAG_HIRES || tag == TAG_LORES) {
+			mode->pixclock = pixclock[tag];
+		}
+	}
+
+	if (amifb_hfmin) {
+		info->monspecs.hfmin = amifb_hfmin;
+		info->monspecs.hfmax = amifb_hfmax;
+		info->monspecs.vfmin = amifb_vfmin;
+		info->monspecs.vfmax = amifb_vfmax;
+	} else {
+		/*
+		 *  These are for a typical Amiga monitor (e.g. A1960)
+		 */
+		info->monspecs.hfmin = 15000;
+		info->monspecs.hfmax = 38000;
+		info->monspecs.vfmin = 49;
+		info->monspecs.vfmax = 90;
+	}
+
+	info->fbops = &amifb_ops;
+	info->flags = FBINFO_DEFAULT;
+	info->device = &pdev->dev;
+
+	if (!fb_find_mode(&info->var, info, mode_option, ami_modedb,
+			  NUM_TOTAL_MODES, &ami_modedb[defmode], 4)) {
+		err = -EINVAL;
+		goto release;
+	}
+
+	fb_videomode_to_modelist(ami_modedb, NUM_TOTAL_MODES,
+				 &info->modelist);
+
+	round_down_bpp = 0;
+	chipptr = chipalloc(info->fix.smem_len + SPRITEMEMSIZE +
+			    DUMMYSPRITEMEMSIZE + COPINITSIZE +
+			    4 * COPLISTSIZE);
+	if (!chipptr) {
+		err = -ENOMEM;
+		goto release;
+	}
+
+	assignchunk(videomemory, u_long, chipptr, info->fix.smem_len);
+	assignchunk(spritememory, u_long, chipptr, SPRITEMEMSIZE);
+	assignchunk(dummysprite, u_short *, chipptr, DUMMYSPRITEMEMSIZE);
+	assignchunk(copdisplay.init, copins *, chipptr, COPINITSIZE);
+	assignchunk(copdisplay.list[0][0], copins *, chipptr, COPLISTSIZE);
+	assignchunk(copdisplay.list[0][1], copins *, chipptr, COPLISTSIZE);
+	assignchunk(copdisplay.list[1][0], copins *, chipptr, COPLISTSIZE);
+	assignchunk(copdisplay.list[1][1], copins *, chipptr, COPLISTSIZE);
+
+	/*
+	 * access the videomem with writethrough cache
+	 */
+	info->fix.smem_start = (u_long)ZTWO_PADDR(videomemory);
+	videomemory = (u_long)ioremap_wt(info->fix.smem_start,
+					 info->fix.smem_len);
+	if (!videomemory) {
+		dev_warn(&pdev->dev,
+			 "Unable to map videomem cached writethrough\n");
+		info->screen_base = ZTWO_VADDR(info->fix.smem_start);
+	} else
+		info->screen_base = (char *)videomemory;
+
+	memset(dummysprite, 0, DUMMYSPRITEMEMSIZE);
+
+	/*
+	 * Make sure the Copper has something to do
+	 */
+	ami_init_copper();
+
+	/*
+	 * Enable Display DMA
+	 */
+	custom.dmacon = DMAF_SETCLR | DMAF_MASTER | DMAF_RASTER | DMAF_COPPER |
+			DMAF_BLITTER | DMAF_SPRITE;
+
+	err = request_irq(IRQ_AMIGA_COPPER, amifb_interrupt, 0,
+			  "fb vertb handler", info->par);
+	if (err)
+		goto disable_dma;
+
+	err = fb_alloc_cmap(&info->cmap, 1 << info->var.bits_per_pixel, 0);
+	if (err)
+		goto free_irq;
+
+	dev_set_drvdata(&pdev->dev, info);
+
+	err = register_framebuffer(info);
+	if (err)
+		goto unset_drvdata;
+
+	fb_info(info, "%s frame buffer device, using %dK of video memory\n",
+		info->fix.id, info->fix.smem_len>>10);
+
+	return 0;
+
+unset_drvdata:
+	fb_dealloc_cmap(&info->cmap);
+free_irq:
+	free_irq(IRQ_AMIGA_COPPER, info->par);
+disable_dma:
+	custom.dmacon = DMAF_ALL | DMAF_MASTER;
+	if (videomemory)
+		iounmap((void *)videomemory);
+	chipfree();
+release:
+	framebuffer_release(info);
+	return err;
+}
+
+
+static int __exit amifb_remove(struct platform_device *pdev)
+{
+	struct fb_info *info = dev_get_drvdata(&pdev->dev);
+
+	unregister_framebuffer(info);
+	fb_dealloc_cmap(&info->cmap);
+	free_irq(IRQ_AMIGA_COPPER, info->par);
+	custom.dmacon = DMAF_ALL | DMAF_MASTER;
+	if (videomemory)
+		iounmap((void *)videomemory);
+	chipfree();
+	framebuffer_release(info);
+	amifb_video_off();
+	return 0;
+}
+
+static struct platform_driver amifb_driver = {
+	.remove = __exit_p(amifb_remove),
+	.driver   = {
+		.name	= "amiga-video",
+	},
+};
+
+module_platform_driver_probe(amifb_driver, amifb_probe);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:amiga-video");