video: fbdev: matrox: the list iterator can't be NULL

[mirror_ubuntu-artful-kernel.git] / drivers / video / fbdev / matrox / matroxfb_base.c

/*
 *
 * Hardware accelerated Matrox Millennium I, II, Mystique, G100, G200 and G400
 *
 * (c) 1998-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
 *
 * Portions Copyright (c) 2001 Matrox Graphics Inc.
 *
 * Version: 1.65 2002/08/14
 *
 * MTRR stuff: 1998 Tom Rini <trini@kernel.crashing.org>
 *
 * Contributors: "menion?" <menion@mindless.com>
 *                     Betatesting, fixes, ideas
 *
 *               "Kurt Garloff" <garloff@suse.de>
 *                     Betatesting, fixes, ideas, videomodes, videomodes timmings
 *
 *               "Tom Rini" <trini@kernel.crashing.org>
 *                     MTRR stuff, PPC cleanups, betatesting, fixes, ideas
 *
 *               "Bibek Sahu" <scorpio@dodds.net>
 *                     Access device through readb|w|l and write b|w|l
 *                     Extensive debugging stuff
 *
 *               "Daniel Haun" <haund@usa.net>
 *                     Testing, hardware cursor fixes
 *
 *               "Scott Wood" <sawst46+@pitt.edu>
 *                     Fixes
 *
 *               "Gerd Knorr" <kraxel@goldbach.isdn.cs.tu-berlin.de>
 *                     Betatesting
 *
 *               "Kelly French" <targon@hazmat.com>
 *               "Fernando Herrera" <fherrera@eurielec.etsit.upm.es>
 *                     Betatesting, bug reporting
 *
 *               "Pablo Bianucci" <pbian@pccp.com.ar>
 *                     Fixes, ideas, betatesting
 *
 *               "Inaky Perez Gonzalez" <inaky@peloncho.fis.ucm.es>
 *                     Fixes, enhandcements, ideas, betatesting
 *
 *               "Ryuichi Oikawa" <roikawa@rr.iiij4u.or.jp>
 *                     PPC betatesting, PPC support, backward compatibility
 *
 *               "Paul Womar" <Paul@pwomar.demon.co.uk>
 *               "Owen Waller" <O.Waller@ee.qub.ac.uk>
 *                     PPC betatesting
 *
 *               "Thomas Pornin" <pornin@bolet.ens.fr>
 *                     Alpha betatesting
 *
 *               "Pieter van Leuven" <pvl@iae.nl>
 *               "Ulf Jaenicke-Roessler" <ujr@physik.phy.tu-dresden.de>
 *                     G100 testing
 *
 *               "H. Peter Arvin" <hpa@transmeta.com>
 *                     Ideas
 *
 *               "Cort Dougan" <cort@cs.nmt.edu>
 *                     CHRP fixes and PReP cleanup
 *
 *               "Mark Vojkovich" <mvojkovi@ucsd.edu>
 *                     G400 support
 *
 *               "Samuel Hocevar" <sam@via.ecp.fr>
 *                     Fixes
 *
 *               "Anton Altaparmakov" <AntonA@bigfoot.com>
 *                     G400 MAX/non-MAX distinction
 *
 *               "Ken Aaker" <kdaaker@rchland.vnet.ibm.com>
 *                     memtype extension (needed for GXT130P RS/6000 adapter)
 *
 *               "Uns Lider" <unslider@miranda.org>
 *                     G100 PLNWT fixes
 *
 *               "Denis Zaitsev" <zzz@cd-club.ru>
 *                     Fixes
 *
 *               "Mike Pieper" <mike@pieper-family.de>
 *                     TVOut enhandcements, V4L2 control interface.
 *
 *               "Diego Biurrun" <diego@biurrun.de>
 *                     DFP testing
 *
 * (following author is not in any relation with this code, but his code
 *  is included in this driver)
 *
 * Based on framebuffer driver for VBE 2.0 compliant graphic boards
 *     (c) 1998 Gerd Knorr <kraxel@cs.tu-berlin.de>
 *
 * (following author is not in any relation with this code, but his ideas
 *  were used when writing this driver)
 *
 *		 FreeVBE/AF (Matrox), "Shawn Hargreaves" <shawn@talula.demon.co.uk>
 *
 */

#include <linux/version.h>

#include "matroxfb_base.h"
#include "matroxfb_misc.h"
#include "matroxfb_accel.h"
#include "matroxfb_DAC1064.h"
#include "matroxfb_Ti3026.h"
#include "matroxfb_maven.h"
#include "matroxfb_crtc2.h"
#include "matroxfb_g450.h"
#include <linux/matroxfb.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

#ifdef CONFIG_PPC_PMAC
#include <asm/machdep.h>
unsigned char nvram_read_byte(int);
static int default_vmode = VMODE_NVRAM;
static int default_cmode = CMODE_NVRAM;
#endif

static void matroxfb_unregister_device(struct matrox_fb_info* minfo);

/* --------------------------------------------------------------------- */

/*
 * card parameters
 */

/* --------------------------------------------------------------------- */

static struct fb_var_screeninfo vesafb_defined = {
	640,480,640,480,/* W,H, W, H (virtual) load xres,xres_virtual*/
	0,0,		/* virtual -> visible no offset */
	8,		/* depth -> load bits_per_pixel */
	0,		/* greyscale ? */
	{0,0,0},	/* R */
	{0,0,0},	/* G */
	{0,0,0},	/* B */
	{0,0,0},	/* transparency */
	0,		/* standard pixel format */
	FB_ACTIVATE_NOW,
	-1,-1,
	FB_ACCELF_TEXT,	/* accel flags */
	39721L,48L,16L,33L,10L,
	96L,2L,~0,	/* No sync info */
	FB_VMODE_NONINTERLACED,
};



/* --------------------------------------------------------------------- */
static void update_crtc2(struct matrox_fb_info *minfo, unsigned int pos)
{
	struct matroxfb_dh_fb_info *info = minfo->crtc2.info;

	/* Make sure that displays are compatible */
	if (info && (info->fbcon.var.bits_per_pixel == minfo->fbcon.var.bits_per_pixel)
		 && (info->fbcon.var.xres_virtual == minfo->fbcon.var.xres_virtual)
		 && (info->fbcon.var.green.length == minfo->fbcon.var.green.length)
		 ) {
		switch (minfo->fbcon.var.bits_per_pixel) {
			case 16:
			case 32:
				pos = pos * 8;
				if (info->interlaced) {
					mga_outl(0x3C2C, pos);
					mga_outl(0x3C28, pos + minfo->fbcon.var.xres_virtual * minfo->fbcon.var.bits_per_pixel / 8);
				} else {
					mga_outl(0x3C28, pos);
				}
				break;
		}
	}
}

static void matroxfb_crtc1_panpos(struct matrox_fb_info *minfo)
{
	if (minfo->crtc1.panpos >= 0) {
		unsigned long flags;
		int panpos;

		matroxfb_DAC_lock_irqsave(flags);
		panpos = minfo->crtc1.panpos;
		if (panpos >= 0) {
			unsigned int extvga_reg;

			minfo->crtc1.panpos = -1; /* No update pending anymore */
			extvga_reg = mga_inb(M_EXTVGA_INDEX);
			mga_setr(M_EXTVGA_INDEX, 0x00, panpos);
			if (extvga_reg != 0x00) {
				mga_outb(M_EXTVGA_INDEX, extvga_reg);
			}
		}
		matroxfb_DAC_unlock_irqrestore(flags);
	}
}

static irqreturn_t matrox_irq(int irq, void *dev_id)
{
	u_int32_t status;
	int handled = 0;
	struct matrox_fb_info *minfo = dev_id;

	status = mga_inl(M_STATUS);

	if (status & 0x20) {
		mga_outl(M_ICLEAR, 0x20);
		minfo->crtc1.vsync.cnt++;
		matroxfb_crtc1_panpos(minfo);
		wake_up_interruptible(&minfo->crtc1.vsync.wait);
		handled = 1;
	}
	if (status & 0x200) {
		mga_outl(M_ICLEAR, 0x200);
		minfo->crtc2.vsync.cnt++;
		wake_up_interruptible(&minfo->crtc2.vsync.wait);
		handled = 1;
	}
	return IRQ_RETVAL(handled);
}

int matroxfb_enable_irq(struct matrox_fb_info *minfo, int reenable)
{
	u_int32_t bm;

	if (minfo->devflags.accelerator == FB_ACCEL_MATROX_MGAG400)
		bm = 0x220;
	else
		bm = 0x020;

	if (!test_and_set_bit(0, &minfo->irq_flags)) {
		if (request_irq(minfo->pcidev->irq, matrox_irq,
				IRQF_SHARED, "matroxfb", minfo)) {
			clear_bit(0, &minfo->irq_flags);
			return -EINVAL;
		}
		/* Clear any pending field interrupts */
		mga_outl(M_ICLEAR, bm);
		mga_outl(M_IEN, mga_inl(M_IEN) | bm);
	} else if (reenable) {
		u_int32_t ien;

		ien = mga_inl(M_IEN);
		if ((ien & bm) != bm) {
			printk(KERN_DEBUG "matroxfb: someone disabled IRQ [%08X]\n", ien);
			mga_outl(M_IEN, ien | bm);
		}
	}
	return 0;
}

static void matroxfb_disable_irq(struct matrox_fb_info *minfo)
{
	if (test_and_clear_bit(0, &minfo->irq_flags)) {
		/* Flush pending pan-at-vbl request... */
		matroxfb_crtc1_panpos(minfo);
		if (minfo->devflags.accelerator == FB_ACCEL_MATROX_MGAG400)
			mga_outl(M_IEN, mga_inl(M_IEN) & ~0x220);
		else
			mga_outl(M_IEN, mga_inl(M_IEN) & ~0x20);
		free_irq(minfo->pcidev->irq, minfo);
	}
}

int matroxfb_wait_for_sync(struct matrox_fb_info *minfo, u_int32_t crtc)
{
	struct matrox_vsync *vs;
	unsigned int cnt;
	int ret;

	switch (crtc) {
		case 0:
			vs = &minfo->crtc1.vsync;
			break;
		case 1:
			if (minfo->devflags.accelerator != FB_ACCEL_MATROX_MGAG400) {
				return -ENODEV;
			}
			vs = &minfo->crtc2.vsync;
			break;
		default:
			return -ENODEV;
	}
	ret = matroxfb_enable_irq(minfo, 0);
	if (ret) {
		return ret;
	}

	cnt = vs->cnt;
	ret = wait_event_interruptible_timeout(vs->wait, cnt != vs->cnt, HZ/10);
	if (ret < 0) {
		return ret;
	}
	if (ret == 0) {
		matroxfb_enable_irq(minfo, 1);
		return -ETIMEDOUT;
	}
	return 0;
}

/* --------------------------------------------------------------------- */

static void matrox_pan_var(struct matrox_fb_info *minfo,
			   struct fb_var_screeninfo *var)
{
	unsigned int pos;
	unsigned short p0, p1, p2;
	unsigned int p3;
	int vbl;
	unsigned long flags;

	CRITFLAGS

	DBG(__func__)

	if (minfo->dead)
		return;

	minfo->fbcon.var.xoffset = var->xoffset;
	minfo->fbcon.var.yoffset = var->yoffset;
	pos = (minfo->fbcon.var.yoffset * minfo->fbcon.var.xres_virtual + minfo->fbcon.var.xoffset) * minfo->curr.final_bppShift / 32;
	pos += minfo->curr.ydstorg.chunks;
	p0 = minfo->hw.CRTC[0x0D] = pos & 0xFF;
	p1 = minfo->hw.CRTC[0x0C] = (pos & 0xFF00) >> 8;
	p2 = minfo->hw.CRTCEXT[0] = (minfo->hw.CRTCEXT[0] & 0xB0) | ((pos >> 16) & 0x0F) | ((pos >> 14) & 0x40);
	p3 = minfo->hw.CRTCEXT[8] = pos >> 21;

	/* FB_ACTIVATE_VBL and we can acquire interrupts? Honor FB_ACTIVATE_VBL then... */
	vbl = (var->activate & FB_ACTIVATE_VBL) && (matroxfb_enable_irq(minfo, 0) == 0);

	CRITBEGIN

	matroxfb_DAC_lock_irqsave(flags);
	mga_setr(M_CRTC_INDEX, 0x0D, p0);
	mga_setr(M_CRTC_INDEX, 0x0C, p1);
	if (minfo->devflags.support32MB)
		mga_setr(M_EXTVGA_INDEX, 0x08, p3);
	if (vbl) {
		minfo->crtc1.panpos = p2;
	} else {
		/* Abort any pending change */
		minfo->crtc1.panpos = -1;
		mga_setr(M_EXTVGA_INDEX, 0x00, p2);
	}
	matroxfb_DAC_unlock_irqrestore(flags);

	update_crtc2(minfo, pos);

	CRITEND
}

static void matroxfb_remove(struct matrox_fb_info *minfo, int dummy)
{
	/* Currently we are holding big kernel lock on all dead & usecount updates.
	 * Destroy everything after all users release it. Especially do not unregister
	 * framebuffer and iounmap memory, neither fbmem nor fbcon-cfb* does not check
	 * for device unplugged when in use.
	 * In future we should point mmio.vbase & video.vbase somewhere where we can
	 * write data without causing too much damage...
	 */

	minfo->dead = 1;
	if (minfo->usecount) {
		/* destroy it later */
		return;
	}
	matroxfb_unregister_device(minfo);
	unregister_framebuffer(&minfo->fbcon);
	matroxfb_g450_shutdown(minfo);
	arch_phys_wc_del(minfo->wc_cookie);
	iounmap(minfo->mmio.vbase.vaddr);
	iounmap(minfo->video.vbase.vaddr);
	release_mem_region(minfo->video.base, minfo->video.len_maximum);
	release_mem_region(minfo->mmio.base, 16384);
	kfree(minfo);
}

	/*
	 * Open/Release the frame buffer device
	 */

static int matroxfb_open(struct fb_info *info, int user)
{
	struct matrox_fb_info *minfo = info2minfo(info);

	DBG_LOOP(__func__)

	if (minfo->dead) {
		return -ENXIO;
	}
	minfo->usecount++;
	if (user) {
		minfo->userusecount++;
	}
	return(0);
}

static int matroxfb_release(struct fb_info *info, int user)
{
	struct matrox_fb_info *minfo = info2minfo(info);

	DBG_LOOP(__func__)

	if (user) {
		if (0 == --minfo->userusecount) {
			matroxfb_disable_irq(minfo);
		}
	}
	if (!(--minfo->usecount) && minfo->dead) {
		matroxfb_remove(minfo, 0);
	}
	return(0);
}

static int matroxfb_pan_display(struct fb_var_screeninfo *var,
		struct fb_info* info) {
	struct matrox_fb_info *minfo = info2minfo(info);

	DBG(__func__)

	matrox_pan_var(minfo, var);
	return 0;
}

static int matroxfb_get_final_bppShift(const struct matrox_fb_info *minfo,
				       int bpp)
{
	int bppshft2;

	DBG(__func__)

	bppshft2 = bpp;
	if (!bppshft2) {
		return 8;
	}
	if (isInterleave(minfo))
		bppshft2 >>= 1;
	if (minfo->devflags.video64bits)
		bppshft2 >>= 1;
	return bppshft2;
}

static int matroxfb_test_and_set_rounding(const struct matrox_fb_info *minfo,
					  int xres, int bpp)
{
	int over;
	int rounding;

	DBG(__func__)

	switch (bpp) {
		case 0:		return xres;
		case 4:		rounding = 128;
				break;
		case 8:		rounding = 64;	/* doc says 64; 32 is OK for G400 */
				break;
		case 16:	rounding = 32;
				break;
		case 24:	rounding = 64;	/* doc says 64; 32 is OK for G400 */
				break;
		default:	rounding = 16;
				/* on G400, 16 really does not work */
				if (minfo->devflags.accelerator == FB_ACCEL_MATROX_MGAG400)
					rounding = 32;
				break;
	}
	if (isInterleave(minfo)) {
		rounding *= 2;
	}
	over = xres % rounding;
	if (over)
		xres += rounding-over;
	return xres;
}

static int matroxfb_pitch_adjust(const struct matrox_fb_info *minfo, int xres,
				 int bpp)
{
	const int* width;
	int xres_new;

	DBG(__func__)

	if (!bpp) return xres;

	width = minfo->capable.vxres;

	if (minfo->devflags.precise_width) {
		while (*width) {
			if ((*width >= xres) && (matroxfb_test_and_set_rounding(minfo, *width, bpp) == *width)) {
				break;
			}
			width++;
		}
		xres_new = *width;
	} else {
		xres_new = matroxfb_test_and_set_rounding(minfo, xres, bpp);
	}
	return xres_new;
}

static int matroxfb_get_cmap_len(struct fb_var_screeninfo *var) {

	DBG(__func__)

	switch (var->bits_per_pixel) {
		case 4:
			return 16;	/* pseudocolor... 16 entries HW palette */
		case 8:
			return 256;	/* pseudocolor... 256 entries HW palette */
		case 16:
			return 16;	/* directcolor... 16 entries SW palette */
					/* Mystique: truecolor, 16 entries SW palette, HW palette hardwired into 1:1 mapping */
		case 24:
			return 16;	/* directcolor... 16 entries SW palette */
					/* Mystique: truecolor, 16 entries SW palette, HW palette hardwired into 1:1 mapping */
		case 32:
			return 16;	/* directcolor... 16 entries SW palette */
					/* Mystique: truecolor, 16 entries SW palette, HW palette hardwired into 1:1 mapping */
	}
	return 16;	/* return something reasonable... or panic()? */
}

static int matroxfb_decode_var(const struct matrox_fb_info *minfo,
			       struct fb_var_screeninfo *var, int *visual,
			       int *video_cmap_len, unsigned int* ydstorg)
{
	struct RGBT {
		unsigned char bpp;
		struct {
			unsigned char offset,
				      length;
		} red,
		  green,
		  blue,
		  transp;
		signed char visual;
	};
	static const struct RGBT table[]= {
		{ 8,{ 0,8},{0,8},{0,8},{ 0,0},MX_VISUAL_PSEUDOCOLOR},
		{15,{10,5},{5,5},{0,5},{15,1},MX_VISUAL_DIRECTCOLOR},
		{16,{11,5},{5,6},{0,5},{ 0,0},MX_VISUAL_DIRECTCOLOR},
		{24,{16,8},{8,8},{0,8},{ 0,0},MX_VISUAL_DIRECTCOLOR},
		{32,{16,8},{8,8},{0,8},{24,8},MX_VISUAL_DIRECTCOLOR}
	};
	struct RGBT const *rgbt;
	unsigned int bpp = var->bits_per_pixel;
	unsigned int vramlen;
	unsigned int memlen;

	DBG(__func__)

	switch (bpp) {
		case 4:	 if (!minfo->capable.cfb4) return -EINVAL;
			 break;
		case 8:	 break;
		case 16: break;
		case 24: break;
		case 32: break;
		default: return -EINVAL;
	}
	*ydstorg = 0;
	vramlen = minfo->video.len_usable;
	if (var->yres_virtual < var->yres)
		var->yres_virtual = var->yres;
	if (var->xres_virtual < var->xres)
		var->xres_virtual = var->xres;

	var->xres_virtual = matroxfb_pitch_adjust(minfo, var->xres_virtual, bpp);
	memlen = var->xres_virtual * bpp * var->yres_virtual / 8;
	if (memlen > vramlen) {
		var->yres_virtual = vramlen * 8 / (var->xres_virtual * bpp);
		memlen = var->xres_virtual * bpp * var->yres_virtual / 8;
	}
	/* There is hardware bug that no line can cross 4MB boundary */
	/* give up for CFB24, it is impossible to easy workaround it */
	/* for other try to do something */
	if (!minfo->capable.cross4MB && (memlen > 0x400000)) {
		if (bpp == 24) {
			/* sorry */
		} else {
			unsigned int linelen;
			unsigned int m1 = linelen = var->xres_virtual * bpp / 8;
			unsigned int m2 = PAGE_SIZE;	/* or 128 if you do not need PAGE ALIGNED address */
			unsigned int max_yres;

			while (m1) {
				while (m2 >= m1) m2 -= m1;
				swap(m1, m2);
			}
			m2 = linelen * PAGE_SIZE / m2;
			*ydstorg = m2 = 0x400000 % m2;
			max_yres = (vramlen - m2) / linelen;
			if (var->yres_virtual > max_yres)
				var->yres_virtual = max_yres;
		}
	}
	/* YDSTLEN contains only signed 16bit value */
	if (var->yres_virtual > 32767)
		var->yres_virtual = 32767;
	/* we must round yres/xres down, we already rounded y/xres_virtual up
	   if it was possible. We should return -EINVAL, but I disagree */
	if (var->yres_virtual < var->yres)
		var->yres = var->yres_virtual;
	if (var->xres_virtual < var->xres)
		var->xres = var->xres_virtual;
	if (var->xoffset + var->xres > var->xres_virtual)
		var->xoffset = var->xres_virtual - var->xres;
	if (var->yoffset + var->yres > var->yres_virtual)
		var->yoffset = var->yres_virtual - var->yres;

	if (bpp == 16 && var->green.length == 5) {
		bpp--; /* an artificial value - 15 */
	}

	for (rgbt = table; rgbt->bpp < bpp; rgbt++);
#define	SETCLR(clr)\
	var->clr.offset = rgbt->clr.offset;\
	var->clr.length = rgbt->clr.length
	SETCLR(red);
	SETCLR(green);
	SETCLR(blue);
	SETCLR(transp);
#undef	SETCLR
	*visual = rgbt->visual;

	if (bpp > 8)
		dprintk("matroxfb: truecolor: "
			"size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
			var->transp.length, var->red.length, var->green.length, var->blue.length,
			var->transp.offset, var->red.offset, var->green.offset, var->blue.offset);

	*video_cmap_len = matroxfb_get_cmap_len(var);
	dprintk(KERN_INFO "requested %d*%d/%dbpp (%d*%d)\n", var->xres, var->yres, var->bits_per_pixel,
				var->xres_virtual, var->yres_virtual);
	return 0;
}

static int matroxfb_setcolreg(unsigned regno, unsigned red, unsigned green,
			      unsigned blue, unsigned transp,
			      struct fb_info *fb_info)
{
	struct matrox_fb_info* minfo = container_of(fb_info, struct matrox_fb_info, fbcon);

	DBG(__func__)

	/*
	 *  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.
	 */

	if (regno >= minfo->curr.cmap_len)
		return 1;

	if (minfo->fbcon.var.grayscale) {
		/* gray = 0.30*R + 0.59*G + 0.11*B */
		red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
	}

	red = CNVT_TOHW(red, minfo->fbcon.var.red.length);
	green = CNVT_TOHW(green, minfo->fbcon.var.green.length);
	blue = CNVT_TOHW(blue, minfo->fbcon.var.blue.length);
	transp = CNVT_TOHW(transp, minfo->fbcon.var.transp.length);

	switch (minfo->fbcon.var.bits_per_pixel) {
	case 4:
	case 8:
		mga_outb(M_DAC_REG, regno);
		mga_outb(M_DAC_VAL, red);
		mga_outb(M_DAC_VAL, green);
		mga_outb(M_DAC_VAL, blue);
		break;
	case 16:
		if (regno >= 16)
			break;
		{
			u_int16_t col =
				(red << minfo->fbcon.var.red.offset)     |
				(green << minfo->fbcon.var.green.offset) |
				(blue << minfo->fbcon.var.blue.offset)   |
				(transp << minfo->fbcon.var.transp.offset); /* for 1:5:5:5 */
			minfo->cmap[regno] = col | (col << 16);
		}
		break;
	case 24:
	case 32:
		if (regno >= 16)
			break;
		minfo->cmap[regno] =
			(red   << minfo->fbcon.var.red.offset)   |
			(green << minfo->fbcon.var.green.offset) |
			(blue  << minfo->fbcon.var.blue.offset)  |
			(transp << minfo->fbcon.var.transp.offset);	/* 8:8:8:8 */
		break;
	}
	return 0;
}

static void matroxfb_init_fix(struct matrox_fb_info *minfo)
{
	struct fb_fix_screeninfo *fix = &minfo->fbcon.fix;
	DBG(__func__)

	strcpy(fix->id,"MATROX");

	fix->xpanstep = 8;	/* 8 for 8bpp, 4 for 16bpp, 2 for 32bpp */
	fix->ypanstep = 1;
	fix->ywrapstep = 0;
	fix->mmio_start = minfo->mmio.base;
	fix->mmio_len = minfo->mmio.len;
	fix->accel = minfo->devflags.accelerator;
}

static void matroxfb_update_fix(struct matrox_fb_info *minfo)
{
	struct fb_fix_screeninfo *fix = &minfo->fbcon.fix;
	DBG(__func__)

	mutex_lock(&minfo->fbcon.mm_lock);
	fix->smem_start = minfo->video.base + minfo->curr.ydstorg.bytes;
	fix->smem_len = minfo->video.len_usable - minfo->curr.ydstorg.bytes;
	mutex_unlock(&minfo->fbcon.mm_lock);
}

static int matroxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
	int err;
	int visual;
	int cmap_len;
	unsigned int ydstorg;
	struct matrox_fb_info *minfo = info2minfo(info);

	if (minfo->dead) {
		return -ENXIO;
	}
	if ((err = matroxfb_decode_var(minfo, var, &visual, &cmap_len, &ydstorg)) != 0)
		return err;
	return 0;
}

static int matroxfb_set_par(struct fb_info *info)
{
	int err;
	int visual;
	int cmap_len;
	unsigned int ydstorg;
	struct fb_var_screeninfo *var;
	struct matrox_fb_info *minfo = info2minfo(info);

	DBG(__func__)

	if (minfo->dead) {
		return -ENXIO;
	}

	var = &info->var;
	if ((err = matroxfb_decode_var(minfo, var, &visual, &cmap_len, &ydstorg)) != 0)
		return err;
	minfo->fbcon.screen_base = vaddr_va(minfo->video.vbase) + ydstorg;
	matroxfb_update_fix(minfo);
	minfo->fbcon.fix.visual = visual;
	minfo->fbcon.fix.type = FB_TYPE_PACKED_PIXELS;
	minfo->fbcon.fix.type_aux = 0;
	minfo->fbcon.fix.line_length = (var->xres_virtual * var->bits_per_pixel) >> 3;
	{
		unsigned int pos;

		minfo->curr.cmap_len = cmap_len;
		ydstorg += minfo->devflags.ydstorg;
		minfo->curr.ydstorg.bytes = ydstorg;
		minfo->curr.ydstorg.chunks = ydstorg >> (isInterleave(minfo) ? 3 : 2);
		if (var->bits_per_pixel == 4)
			minfo->curr.ydstorg.pixels = ydstorg;
		else
			minfo->curr.ydstorg.pixels = (ydstorg * 8) / var->bits_per_pixel;
		minfo->curr.final_bppShift = matroxfb_get_final_bppShift(minfo, var->bits_per_pixel);
		{	struct my_timming mt;
			struct matrox_hw_state* hw;
			int out;

			matroxfb_var2my(var, &mt);
			mt.crtc = MATROXFB_SRC_CRTC1;
			/* CRTC1 delays */
			switch (var->bits_per_pixel) {
				case  0:	mt.delay = 31 + 0; break;
				case 16:	mt.delay = 21 + 8; break;
				case 24:	mt.delay = 17 + 8; break;
				case 32:	mt.delay = 16 + 8; break;
				default:	mt.delay = 31 + 8; break;
			}

			hw = &minfo->hw;

			down_read(&minfo->altout.lock);
			for (out = 0; out < MATROXFB_MAX_OUTPUTS; out++) {
				if (minfo->outputs[out].src == MATROXFB_SRC_CRTC1 &&
				    minfo->outputs[out].output->compute) {
					minfo->outputs[out].output->compute(minfo->outputs[out].data, &mt);
				}
			}
			up_read(&minfo->altout.lock);
			minfo->crtc1.pixclock = mt.pixclock;
			minfo->crtc1.mnp = mt.mnp;
			minfo->hw_switch->init(minfo, &mt);
			pos = (var->yoffset * var->xres_virtual + var->xoffset) * minfo->curr.final_bppShift / 32;
			pos += minfo->curr.ydstorg.chunks;

			hw->CRTC[0x0D] = pos & 0xFF;
			hw->CRTC[0x0C] = (pos & 0xFF00) >> 8;
			hw->CRTCEXT[0] = (hw->CRTCEXT[0] & 0xF0) | ((pos >> 16) & 0x0F) | ((pos >> 14) & 0x40);
			hw->CRTCEXT[8] = pos >> 21;
			minfo->hw_switch->restore(minfo);
			update_crtc2(minfo, pos);
			down_read(&minfo->altout.lock);
			for (out = 0; out < MATROXFB_MAX_OUTPUTS; out++) {
				if (minfo->outputs[out].src == MATROXFB_SRC_CRTC1 &&
				    minfo->outputs[out].output->program) {
					minfo->outputs[out].output->program(minfo->outputs[out].data);
				}
			}
			for (out = 0; out < MATROXFB_MAX_OUTPUTS; out++) {
				if (minfo->outputs[out].src == MATROXFB_SRC_CRTC1 &&
				    minfo->outputs[out].output->start) {
					minfo->outputs[out].output->start(minfo->outputs[out].data);
				}
			}
			up_read(&minfo->altout.lock);
			matrox_cfbX_init(minfo);
		}
	}
	minfo->initialized = 1;
	return 0;
}

static int matroxfb_get_vblank(struct matrox_fb_info *minfo,
			       struct fb_vblank *vblank)
{
	unsigned int sts1;

	matroxfb_enable_irq(minfo, 0);
	memset(vblank, 0, sizeof(*vblank));
	vblank->flags = FB_VBLANK_HAVE_VCOUNT | FB_VBLANK_HAVE_VSYNC |
			FB_VBLANK_HAVE_VBLANK | FB_VBLANK_HAVE_HBLANK;
	sts1 = mga_inb(M_INSTS1);
	vblank->vcount = mga_inl(M_VCOUNT);
	/* BTW, on my PIII/450 with G400, reading M_INSTS1
	   byte makes this call about 12% slower (1.70 vs. 2.05 us
	   per ioctl()) */
	if (sts1 & 1)
		vblank->flags |= FB_VBLANK_HBLANKING;
	if (sts1 & 8)
		vblank->flags |= FB_VBLANK_VSYNCING;
	if (vblank->vcount >= minfo->fbcon.var.yres)
		vblank->flags |= FB_VBLANK_VBLANKING;
	if (test_bit(0, &minfo->irq_flags)) {
		vblank->flags |= FB_VBLANK_HAVE_COUNT;
		/* Only one writer, aligned int value...
		   it should work without lock and without atomic_t */
		vblank->count = minfo->crtc1.vsync.cnt;
	}
	return 0;
}

static struct matrox_altout panellink_output = {
	.name	 = "Panellink output",
};

static int matroxfb_ioctl(struct fb_info *info,
			  unsigned int cmd, unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	struct matrox_fb_info *minfo = info2minfo(info);

	DBG(__func__)

	if (minfo->dead) {
		return -ENXIO;
	}

	switch (cmd) {
		case FBIOGET_VBLANK:
			{
				struct fb_vblank vblank;
				int err;

				err = matroxfb_get_vblank(minfo, &vblank);
				if (err)
					return err;
				if (copy_to_user(argp, &vblank, sizeof(vblank)))
					return -EFAULT;
				return 0;
			}
		case FBIO_WAITFORVSYNC:
			{
				u_int32_t crt;

				if (get_user(crt, (u_int32_t __user *)arg))
					return -EFAULT;

				return matroxfb_wait_for_sync(minfo, crt);
			}
		case MATROXFB_SET_OUTPUT_MODE:
			{
				struct matroxioc_output_mode mom;
				struct matrox_altout *oproc;
				int val;

				if (copy_from_user(&mom, argp, sizeof(mom)))
					return -EFAULT;
				if (mom.output >= MATROXFB_MAX_OUTPUTS)
					return -ENXIO;
				down_read(&minfo->altout.lock);
				oproc = minfo->outputs[mom.output].output;
				if (!oproc) {
					val = -ENXIO;
				} else if (!oproc->verifymode) {
					if (mom.mode == MATROXFB_OUTPUT_MODE_MONITOR) {
						val = 0;
					} else {
						val = -EINVAL;
					}
				} else {
					val = oproc->verifymode(minfo->outputs[mom.output].data, mom.mode);
				}
				if (!val) {
					if (minfo->outputs[mom.output].mode != mom.mode) {
						minfo->outputs[mom.output].mode = mom.mode;
						val = 1;
					}
				}
				up_read(&minfo->altout.lock);
				if (val != 1)
					return val;
				switch (minfo->outputs[mom.output].src) {
					case MATROXFB_SRC_CRTC1:
						matroxfb_set_par(info);
						break;
					case MATROXFB_SRC_CRTC2:
						{
							struct matroxfb_dh_fb_info* crtc2;

							down_read(&minfo->crtc2.lock);
							crtc2 = minfo->crtc2.info;
							if (crtc2)
								crtc2->fbcon.fbops->fb_set_par(&crtc2->fbcon);
							up_read(&minfo->crtc2.lock);
						}
						break;
				}
				return 0;
			}
		case MATROXFB_GET_OUTPUT_MODE:
			{
				struct matroxioc_output_mode mom;
				struct matrox_altout *oproc;
				int val;

				if (copy_from_user(&mom, argp, sizeof(mom)))
					return -EFAULT;
				if (mom.output >= MATROXFB_MAX_OUTPUTS)
					return -ENXIO;
				down_read(&minfo->altout.lock);
				oproc = minfo->outputs[mom.output].output;
				if (!oproc) {
					val = -ENXIO;
				} else {
					mom.mode = minfo->outputs[mom.output].mode;
					val = 0;
				}
				up_read(&minfo->altout.lock);
				if (val)
					return val;
				if (copy_to_user(argp, &mom, sizeof(mom)))
					return -EFAULT;
				return 0;
			}
		case MATROXFB_SET_OUTPUT_CONNECTION:
			{
				u_int32_t tmp;
				int i;
				int changes;

				if (copy_from_user(&tmp, argp, sizeof(tmp)))
					return -EFAULT;
				for (i = 0; i < 32; i++) {
					if (tmp & (1 << i)) {
						if (i >= MATROXFB_MAX_OUTPUTS)
							return -ENXIO;
						if (!minfo->outputs[i].output)
							return -ENXIO;
						switch (minfo->outputs[i].src) {
							case MATROXFB_SRC_NONE:
							case MATROXFB_SRC_CRTC1:
								break;
							default:
								return -EBUSY;
						}
					}
				}
				if (minfo->devflags.panellink) {
					if (tmp & MATROXFB_OUTPUT_CONN_DFP) {
						if (tmp & MATROXFB_OUTPUT_CONN_SECONDARY)
							return -EINVAL;
						for (i = 0; i < MATROXFB_MAX_OUTPUTS; i++) {
							if (minfo->outputs[i].src == MATROXFB_SRC_CRTC2) {
								return -EBUSY;
							}
						}
					}
				}
				changes = 0;
				for (i = 0; i < MATROXFB_MAX_OUTPUTS; i++) {
					if (tmp & (1 << i)) {
						if (minfo->outputs[i].src != MATROXFB_SRC_CRTC1) {
							changes = 1;
							minfo->outputs[i].src = MATROXFB_SRC_CRTC1;
						}
					} else if (minfo->outputs[i].src == MATROXFB_SRC_CRTC1) {
						changes = 1;
						minfo->outputs[i].src = MATROXFB_SRC_NONE;
					}
				}
				if (!changes)
					return 0;
				matroxfb_set_par(info);
				return 0;
			}
		case MATROXFB_GET_OUTPUT_CONNECTION:
			{
				u_int32_t conn = 0;
				int i;

				for (i = 0; i < MATROXFB_MAX_OUTPUTS; i++) {
					if (minfo->outputs[i].src == MATROXFB_SRC_CRTC1) {
						conn |= 1 << i;
					}
				}
				if (put_user(conn, (u_int32_t __user *)arg))
					return -EFAULT;
				return 0;
			}
		case MATROXFB_GET_AVAILABLE_OUTPUTS:
			{
				u_int32_t conn = 0;
				int i;

				for (i = 0; i < MATROXFB_MAX_OUTPUTS; i++) {
					if (minfo->outputs[i].output) {
						switch (minfo->outputs[i].src) {
							case MATROXFB_SRC_NONE:
							case MATROXFB_SRC_CRTC1:
								conn |= 1 << i;
								break;
						}
					}
				}
				if (minfo->devflags.panellink) {
					if (conn & MATROXFB_OUTPUT_CONN_DFP)
						conn &= ~MATROXFB_OUTPUT_CONN_SECONDARY;
					if (conn & MATROXFB_OUTPUT_CONN_SECONDARY)
						conn &= ~MATROXFB_OUTPUT_CONN_DFP;
				}
				if (put_user(conn, (u_int32_t __user *)arg))
					return -EFAULT;
				return 0;
			}
		case MATROXFB_GET_ALL_OUTPUTS:
			{
				u_int32_t conn = 0;
				int i;

				for (i = 0; i < MATROXFB_MAX_OUTPUTS; i++) {
					if (minfo->outputs[i].output) {
						conn |= 1 << i;
					}
				}
				if (put_user(conn, (u_int32_t __user *)arg))
					return -EFAULT;
				return 0;
			}
		case VIDIOC_QUERYCAP:
			{
				struct v4l2_capability r;

				memset(&r, 0, sizeof(r));
				strcpy(r.driver, "matroxfb");
				strcpy(r.card, "Matrox");
				sprintf(r.bus_info, "PCI:%s", pci_name(minfo->pcidev));
				r.version = KERNEL_VERSION(1,0,0);
				r.capabilities = V4L2_CAP_VIDEO_OUTPUT;
				if (copy_to_user(argp, &r, sizeof(r)))
					return -EFAULT;
				return 0;

			}
		case VIDIOC_QUERYCTRL:
			{
				struct v4l2_queryctrl qctrl;
				int err;

				if (copy_from_user(&qctrl, argp, sizeof(qctrl)))
					return -EFAULT;

				down_read(&minfo->altout.lock);
				if (!minfo->outputs[1].output) {
					err = -ENXIO;
				} else if (minfo->outputs[1].output->getqueryctrl) {
					err = minfo->outputs[1].output->getqueryctrl(minfo->outputs[1].data, &qctrl);
				} else {
					err = -EINVAL;
				}
				up_read(&minfo->altout.lock);
				if (err >= 0 &&
				    copy_to_user(argp, &qctrl, sizeof(qctrl)))
					return -EFAULT;
				return err;
			}
		case VIDIOC_G_CTRL:
			{
				struct v4l2_control ctrl;
				int err;

				if (copy_from_user(&ctrl, argp, sizeof(ctrl)))
					return -EFAULT;

				down_read(&minfo->altout.lock);
				if (!minfo->outputs[1].output) {
					err = -ENXIO;
				} else if (minfo->outputs[1].output->getctrl) {
					err = minfo->outputs[1].output->getctrl(minfo->outputs[1].data, &ctrl);
				} else {
					err = -EINVAL;
				}
				up_read(&minfo->altout.lock);
				if (err >= 0 &&
				    copy_to_user(argp, &ctrl, sizeof(ctrl)))
					return -EFAULT;
				return err;
			}
		case VIDIOC_S_CTRL:
			{
				struct v4l2_control ctrl;
				int err;

				if (copy_from_user(&ctrl, argp, sizeof(ctrl)))
					return -EFAULT;

				down_read(&minfo->altout.lock);
				if (!minfo->outputs[1].output) {
					err = -ENXIO;
				} else if (minfo->outputs[1].output->setctrl) {
					err = minfo->outputs[1].output->setctrl(minfo->outputs[1].data, &ctrl);
				} else {
					err = -EINVAL;
				}
				up_read(&minfo->altout.lock);
				return err;
			}
	}
	return -ENOTTY;
}

/* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */

static int matroxfb_blank(int blank, struct fb_info *info)
{
	int seq;
	int crtc;
	CRITFLAGS
	struct matrox_fb_info *minfo = info2minfo(info);

	DBG(__func__)

	if (minfo->dead)
		return 1;

	switch (blank) {
	case FB_BLANK_NORMAL:  seq = 0x20; crtc = 0x00; break; /* works ??? */
	case FB_BLANK_VSYNC_SUSPEND:  seq = 0x20; crtc = 0x10; break;
	case FB_BLANK_HSYNC_SUSPEND:  seq = 0x20; crtc = 0x20; break;
	case FB_BLANK_POWERDOWN:  seq = 0x20; crtc = 0x30; break;
	default: seq = 0x00; crtc = 0x00; break;
	}

	CRITBEGIN

	mga_outb(M_SEQ_INDEX, 1);
	mga_outb(M_SEQ_DATA, (mga_inb(M_SEQ_DATA) & ~0x20) | seq);
	mga_outb(M_EXTVGA_INDEX, 1);
	mga_outb(M_EXTVGA_DATA, (mga_inb(M_EXTVGA_DATA) & ~0x30) | crtc);

	CRITEND
	return 0;
}

static struct fb_ops matroxfb_ops = {
	.owner =	THIS_MODULE,
	.fb_open =	matroxfb_open,
	.fb_release =	matroxfb_release,
	.fb_check_var =	matroxfb_check_var,
	.fb_set_par =	matroxfb_set_par,
	.fb_setcolreg =	matroxfb_setcolreg,
	.fb_pan_display =matroxfb_pan_display,
	.fb_blank =	matroxfb_blank,
	.fb_ioctl =	matroxfb_ioctl,
/*	.fb_fillrect =	<set by matrox_cfbX_init>, */
/*	.fb_copyarea =	<set by matrox_cfbX_init>, */
/*	.fb_imageblit =	<set by matrox_cfbX_init>, */
/*	.fb_cursor =	<set by matrox_cfbX_init>, */
};

#define RSDepth(X)	(((X) >> 8) & 0x0F)
#define RS8bpp		0x1
#define RS15bpp		0x2
#define RS16bpp		0x3
#define RS32bpp		0x4
#define RS4bpp		0x5
#define RS24bpp		0x6
#define RSText		0x7
#define RSText8		0x8
/* 9-F */
static struct { struct fb_bitfield red, green, blue, transp; int bits_per_pixel; } colors[] = {
	{ {  0, 8, 0}, { 0, 8, 0}, { 0, 8, 0}, {  0, 0, 0},  8 },
	{ { 10, 5, 0}, { 5, 5, 0}, { 0, 5, 0}, { 15, 1, 0}, 16 },
	{ { 11, 5, 0}, { 5, 6, 0}, { 0, 5, 0}, {  0, 0, 0}, 16 },
	{ { 16, 8, 0}, { 8, 8, 0}, { 0, 8, 0}, { 24, 8, 0}, 32 },
	{ {  0, 8, 0}, { 0, 8, 0}, { 0, 8, 0}, {  0, 0, 0},  4 },
	{ { 16, 8, 0}, { 8, 8, 0}, { 0, 8, 0}, {  0, 0, 0}, 24 },
	{ {  0, 6, 0}, { 0, 6, 0}, { 0, 6, 0}, {  0, 0, 0},  0 },	/* textmode with (default) VGA8x16 */
	{ {  0, 6, 0}, { 0, 6, 0}, { 0, 6, 0}, {  0, 0, 0},  0 },	/* textmode hardwired to VGA8x8 */
};

/* initialized by setup, see explanation at end of file (search for MODULE_PARM_DESC) */
static unsigned int mem;		/* "matroxfb:mem:xxxxxM" */
static int option_precise_width = 1;	/* cannot be changed, option_precise_width==0 must imply noaccel */
static int inv24;			/* "matroxfb:inv24" */
static int cross4MB = -1;		/* "matroxfb:cross4MB" */
static int disabled;			/* "matroxfb:disabled" */
static int noaccel;			/* "matroxfb:noaccel" */
static int nopan;			/* "matroxfb:nopan" */
static int no_pci_retry;		/* "matroxfb:nopciretry" */
static int novga;			/* "matroxfb:novga" */
static int nobios;			/* "matroxfb:nobios" */
static int noinit = 1;			/* "matroxfb:init" */
static int inverse;			/* "matroxfb:inverse" */
static int sgram;			/* "matroxfb:sgram" */
static int mtrr = 1;			/* "matroxfb:nomtrr" */
static int grayscale;			/* "matroxfb:grayscale" */
static int dev = -1;			/* "matroxfb:dev:xxxxx" */
static unsigned int vesa = ~0;		/* "matroxfb:vesa:xxxxx" */
static int depth = -1;			/* "matroxfb:depth:xxxxx" */
static unsigned int xres;		/* "matroxfb:xres:xxxxx" */
static unsigned int yres;		/* "matroxfb:yres:xxxxx" */
static unsigned int upper = ~0;		/* "matroxfb:upper:xxxxx" */
static unsigned int lower = ~0;		/* "matroxfb:lower:xxxxx" */
static unsigned int vslen;		/* "matroxfb:vslen:xxxxx" */
static unsigned int left = ~0;		/* "matroxfb:left:xxxxx" */
static unsigned int right = ~0;		/* "matroxfb:right:xxxxx" */
static unsigned int hslen;		/* "matroxfb:hslen:xxxxx" */
static unsigned int pixclock;		/* "matroxfb:pixclock:xxxxx" */
static int sync = -1;			/* "matroxfb:sync:xxxxx" */
static unsigned int fv;			/* "matroxfb:fv:xxxxx" */
static unsigned int fh;			/* "matroxfb:fh:xxxxxk" */
static unsigned int maxclk;		/* "matroxfb:maxclk:xxxxM" */
static int dfp;				/* "matroxfb:dfp */
static int dfp_type = -1;		/* "matroxfb:dfp:xxx */
static int memtype = -1;		/* "matroxfb:memtype:xxx" */
static char outputs[8];			/* "matroxfb:outputs:xxx" */

#ifndef MODULE
static char videomode[64];		/* "matroxfb:mode:xxxxx" or "matroxfb:xxxxx" */
#endif

static int matroxfb_getmemory(struct matrox_fb_info *minfo,
			      unsigned int maxSize, unsigned int *realSize)
{
	vaddr_t vm;
	unsigned int offs;
	unsigned int offs2;