/* 
 * stradis.c - stradis 4:2:2 mpeg decoder driver
 *
 * Stradis 4:2:2 MPEG-2 Decoder Driver
 * Copyright (C) 1999 Nathan Laredo <laredo@gnu.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/pci.h>
#include <linux/signal.h>
#include <asm/io.h>
#include <linux/ioport.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <linux/sched.h>
#include <asm/types.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/videodev.h>

#include "saa7146.h"
#include "saa7146reg.h"
#include "ibmmpeg2.h"
#include "saa7121.h"
#include "cs8420.h"

#define DEBUG(x) 		/* debug driver */
#undef  IDEBUG	 		/* debug irq handler */
#undef  MDEBUG	 		/* debug memory management */

#define SAA7146_MAX 6

static struct saa7146 saa7146s[SAA7146_MAX];

static int saa_num = 0;		/* number of SAA7146s in use */

static int video_nr = -1;
module_param(video_nr, int, 0);
MODULE_LICENSE("GPL");


#define nDebNormal	0x00480000
#define nDebNoInc	0x00480000
#define nDebVideo	0xd0480000
#define nDebAudio	0xd0400000
#define nDebDMA		0x02c80000

#define oDebNormal	0x13c80000
#define oDebNoInc	0x13c80000
#define oDebVideo	0xd1080000
#define oDebAudio	0xd1080000
#define oDebDMA		0x03080000

#define NewCard		(saa->boardcfg[3])
#define ChipControl	(saa->boardcfg[1])
#define NTSCFirstActive	(saa->boardcfg[4])
#define PALFirstActive	(saa->boardcfg[5])
#define NTSCLastActive	(saa->boardcfg[54])
#define PALLastActive	(saa->boardcfg[55])
#define Have2MB		(saa->boardcfg[18] & 0x40)
#define HaveCS8420	(saa->boardcfg[18] & 0x04)
#define IBMMPEGCD20	(saa->boardcfg[18] & 0x20)
#define HaveCS3310	(saa->boardcfg[18] & 0x01)
#define CS3310MaxLvl	((saa->boardcfg[30] << 8) | saa->boardcfg[31])
#define HaveCS4341	(saa->boardcfg[40] == 2)
#define SDIType		(saa->boardcfg[27])
#define CurrentMode	(saa->boardcfg[2])

#define debNormal	(NewCard ? nDebNormal : oDebNormal)
#define debNoInc	(NewCard ? nDebNoInc : oDebNoInc)
#define debVideo	(NewCard ? nDebVideo : oDebVideo)
#define debAudio	(NewCard ? nDebAudio : oDebAudio)
#define debDMA		(NewCard ? nDebDMA : oDebDMA)

#ifdef USE_RESCUE_EEPROM_SDM275
static unsigned char rescue_eeprom[64] = {
0x00,0x01,0x04,0x13,0x26,0x0f,0x10,0x00,0x00,0x00,0x43,0x63,0x22,0x01,0x29,0x15,0x73,0x00,0x1f, 'd', 'e', 'c', 'x', 'l', 'd', 'v', 'a',0x02,0x00,0x01,0x00,0xcc,0xa4,0x63,0x09,0xe2,0x10,0x00,0x0a,0x00,0x02,0x02, 'd', 'e', 'c', 'x', 'l', 'a',0x00,0x00,0x42,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};
#endif

/* ----------------------------------------------------------------------- */
/* Hardware I2C functions */
static void I2CWipe(struct saa7146 *saa)
{
	int i;
	/* set i2c to ~=100kHz, abort transfer, clear busy */
	saawrite(0x600 | SAA7146_I2C_ABORT, SAA7146_I2C_STATUS);
	saawrite((SAA7146_MC2_UPLD_I2C << 16) |
		 SAA7146_MC2_UPLD_I2C, SAA7146_MC2);
	/* wait for i2c registers to be programmed */
	for (i = 0; i < 1000 &&
	     !(saaread(SAA7146_MC2) & SAA7146_MC2_UPLD_I2C); i++)
		schedule();
	saawrite(0x600, SAA7146_I2C_STATUS);
	saawrite((SAA7146_MC2_UPLD_I2C << 16) |
		 SAA7146_MC2_UPLD_I2C, SAA7146_MC2);
	/* wait for i2c registers to be programmed */
	for (i = 0; i < 1000 &&
	     !(saaread(SAA7146_MC2) & SAA7146_MC2_UPLD_I2C); i++)
		schedule();
	saawrite(0x600, SAA7146_I2C_STATUS);
	saawrite((SAA7146_MC2_UPLD_I2C << 16) |
		 SAA7146_MC2_UPLD_I2C, SAA7146_MC2);
	/* wait for i2c registers to be programmed */
	for (i = 0; i < 1000 &&
	     !(saaread(SAA7146_MC2) & SAA7146_MC2_UPLD_I2C); i++)
		schedule();
}

/* read I2C */
static int I2CRead(struct saa7146 *saa, unsigned char addr,
		   unsigned char subaddr, int dosub)
{
	int i;

	if (saaread(SAA7146_I2C_STATUS) & 0x3c)
		I2CWipe(saa);
	for (i = 0; i < 1000 &&
	     (saaread(SAA7146_I2C_STATUS) & SAA7146_I2C_BUSY); i++)
		schedule();
	if (i == 1000)
		I2CWipe(saa);
	if (dosub)
		saawrite(((addr & 0xfe) << 24) | (((addr | 1) & 0xff) << 8) |
		  ((subaddr & 0xff) << 16) | 0xed, SAA7146_I2C_TRANSFER);
	else
		saawrite(((addr & 0xfe) << 24) | (((addr | 1) & 0xff) << 16) |
			 0xf1, SAA7146_I2C_TRANSFER);
	saawrite((SAA7146_MC2_UPLD_I2C << 16) |
		 SAA7146_MC2_UPLD_I2C, SAA7146_MC2);
	/* wait for i2c registers to be programmed */
	for (i = 0; i < 1000 &&
	     !(saaread(SAA7146_MC2) & SAA7146_MC2_UPLD_I2C); i++)
		schedule();
	/* wait for valid data */
	for (i = 0; i < 1000 &&
	     (saaread(SAA7146_I2C_STATUS) & SAA7146_I2C_BUSY); i++)
		schedule();
	if (saaread(SAA7146_I2C_STATUS) & SAA7146_I2C_ERR)
		return -1;
	if (i == 1000) 
		printk("i2c setup read timeout\n");
	saawrite(0x41, SAA7146_I2C_TRANSFER);
	saawrite((SAA7146_MC2_UPLD_I2C << 16) |
		 SAA7146_MC2_UPLD_I2C, SAA7146_MC2);
	/* wait for i2c registers to be programmed */
	for (i = 0; i < 1000 &&
	     !(saaread(SAA7146_MC2) & SAA7146_MC2_UPLD_I2C); i++)
		schedule();
	/* wait for valid data */
	for (i = 0; i < 1000 &&
	     (saaread(SAA7146_I2C_TRANSFER) & SAA7146_I2C_BUSY); i++)
		schedule();
	if (saaread(SAA7146_I2C_TRANSFER) & SAA7146_I2C_ERR)
		return -1;
	if (i == 1000) 
		printk("i2c read timeout\n");
	return ((saaread(SAA7146_I2C_TRANSFER) >> 24) & 0xff);
}

/* set both to write both bytes, reset it to write only b1 */

static int I2CWrite(struct saa7146 *saa, unsigned char addr, unsigned char b1,
		    unsigned char b2, int both)
{
	int i;
	u32 data;

	if (saaread(SAA7146_I2C_STATUS) & 0x3c)
		I2CWipe(saa);
	for (i = 0; i < 1000 &&
	     (saaread(SAA7146_I2C_STATUS) & SAA7146_I2C_BUSY); i++)
		schedule();
	if (i == 1000)
		I2CWipe(saa);
	data = ((addr & 0xfe) << 24) | ((b1 & 0xff) << 16);
	if (both)
		data |= ((b2 & 0xff) << 8) | 0xe5;
	else
		data |= 0xd1;
	saawrite(data, SAA7146_I2C_TRANSFER);
	saawrite((SAA7146_MC2_UPLD_I2C << 16) | SAA7146_MC2_UPLD_I2C,
		 SAA7146_MC2);
	return 0;
}

static void attach_inform(struct saa7146 *saa, int id)
{
	int i;

	DEBUG(printk(KERN_DEBUG "stradis%d: i2c: device found=%02x\n", saa->nr, id));
	if (id == 0xa0)	{ /* we have rev2 or later board, fill in info */
		for (i = 0; i < 64; i++)
			saa->boardcfg[i] = I2CRead(saa, 0xa0, i, 1);
#ifdef USE_RESCUE_EEPROM_SDM275
		if (saa->boardcfg[0] != 0) {
			printk("stradis%d: WARNING: EEPROM STORED VALUES HAVE BEEN IGNORED\n", saa->nr);
			for (i = 0; i < 64; i++)
				saa->boardcfg[i] = rescue_eeprom[i];
		}
#endif
		printk("stradis%d: config =", saa->nr);
		for (i = 0; i < 51; i++) {
			printk(" %02x",saa->boardcfg[i]);
		}
		printk("\n");
	}
}

static void I2CBusScan(struct saa7146 *saa)
{
	int i;
	for (i = 0; i < 0xff; i += 2)
		if ((I2CRead(saa, i, 0, 0)) >= 0)
			attach_inform(saa, i);
}

static int debiwait_maxwait = 0;

static int wait_for_debi_done(struct saa7146 *saa)
{
	int i;

	/* wait for registers to be programmed */
	for (i = 0; i < 100000 &&
	     !(saaread(SAA7146_MC2) & SAA7146_MC2_UPLD_DEBI); i++)
		saaread(SAA7146_MC2);
	/* wait for transfer to complete */
	for (i = 0; i < 500000 &&
	     (saaread(SAA7146_PSR) & SAA7146_PSR_DEBI_S); i++)
		saaread(SAA7146_MC2);
	if (i > debiwait_maxwait)
		printk("wait-for-debi-done maxwait: %d\n",
			debiwait_maxwait = i);
	
	if (i == 500000)
		return -1;
	return 0;
}

static int debiwrite(struct saa7146 *saa, u32 config, int addr,
		      u32 val, int count)
{
	u32 cmd;
	if (count <= 0 || count > 32764)
		return -1;
	if (wait_for_debi_done(saa) < 0)
		return -1;
	saawrite(config, SAA7146_DEBI_CONFIG);
	if (count <= 4)		/* immediate transfer */
		saawrite(val, SAA7146_DEBI_AD);
	else			/* block transfer */
		saawrite(virt_to_bus(saa->dmadebi), SAA7146_DEBI_AD);
	saawrite((cmd = (count << 17) | (addr & 0xffff)), SAA7146_DEBI_COMMAND);
	saawrite((SAA7146_MC2_UPLD_DEBI << 16) | SAA7146_MC2_UPLD_DEBI,
		 SAA7146_MC2);
	return 0;
}

static u32 debiread(struct saa7146 *saa, u32 config, int addr, int count)
{
	u32 result = 0;

	if (count > 32764 || count <= 0)
		return 0;
	if (wait_for_debi_done(saa) < 0)
		return 0;
	saawrite(virt_to_bus(saa->dmadebi), SAA7146_DEBI_AD);
	saawrite((count << 17) | 0x10000 | (addr & 0xffff),
		 SAA7146_DEBI_COMMAND);
	saawrite(config, SAA7146_DEBI_CONFIG);
	saawrite((SAA7146_MC2_UPLD_DEBI << 16) | SAA7146_MC2_UPLD_DEBI,
		 SAA7146_MC2);
	if (count > 4)		/* not an immediate transfer */
		return count;
	wait_for_debi_done(saa);
	result = saaread(SAA7146_DEBI_AD);
	if (count == 1)
		result &= 0xff;
	if (count == 2)
		result &= 0xffff;
	if (count == 3)
		result &= 0xffffff;
	return result;
}

#if 0 /* unused */
/* MUST be a multiple of 8 bytes and 8-byte aligned and < 32768 bytes */
/* data copied into saa->dmadebi buffer, caller must re-enable interrupts */
static void ibm_block_dram_read(struct saa7146 *saa, int address, int bytes)
{
	int i, j;
	u32 *buf;
	buf = (u32 *) saa->dmadebi;
	if (bytes > 0x7000)
		bytes = 0x7000;
	saawrite(0, SAA7146_IER);	/* disable interrupts */
	for (i=0; i < 10000 &&
		(debiread(saa, debNormal, IBM_MP2_DRAM_CMD_STAT, 2)
		& 0x8000); i++)
		saaread(SAA7146_MC2);
	if (i == 10000)
		printk(KERN_ERR "stradis%d: dram_busy never cleared\n",
			saa->nr);
	debiwrite(saa, debNormal, IBM_MP2_SRC_ADDR, (address<<16) |
		(address>>16), 4);
	debiwrite(saa, debNormal, IBM_MP2_BLOCK_SIZE, bytes, 2);
	debiwrite(saa, debNormal, IBM_MP2_CMD_STAT, 0x8a10, 2);
	for (j = 0; j < bytes/4; j++) {
		for (i = 0; i < 10000 &&
			(!(debiread(saa, debNormal, IBM_MP2_DRAM_CMD_STAT, 2)
			& 0x4000)); i++)
			saaread(SAA7146_MC2);
		if (i == 10000)
			printk(KERN_ERR "stradis%d: dram_ready never set\n",
				saa->nr);
		buf[j] = debiread(saa, debNormal, IBM_MP2_DRAM_DATA, 4);
	}
}
#endif /* unused */

static void do_irq_send_data(struct saa7146 *saa)
{
	int split, audbytes, vidbytes;

	saawrite(SAA7146_PSR_PIN1, SAA7146_IER);
	/* if special feature mode in effect, disable audio sending */
	if (saa->playmode != VID_PLAY_NORMAL)
		saa->audtail = saa->audhead = 0;
	if (saa->audhead <= saa->audtail)
		audbytes = saa->audtail - saa->audhead;
	else
		audbytes = 65536 - (saa->audhead - saa->audtail);
	if (saa->vidhead <= saa->vidtail)
		vidbytes = saa->vidtail - saa->vidhead;
	else
		vidbytes = 524288 - (saa->vidhead - saa->vidtail);
	if (audbytes == 0 && vidbytes == 0 && saa->osdtail == saa->osdhead) {
		saawrite(0, SAA7146_IER);
		return;
	}
	/* if at least 1 block audio waiting and audio fifo isn't full */
	if (audbytes >= 2048 && (debiread(saa, debNormal,
		IBM_MP2_AUD_FIFO, 2) & 0xff) < 60) {
		if (saa->audhead > saa->audtail)
			split = 65536 - saa->audhead;
		else
			split = 0;
		audbytes = 2048;
		if (split > 0 && split < 2048) {
			memcpy(saa->dmadebi, saa->audbuf + saa->audhead,
				split);
			saa->audhead = 0;
			audbytes -= split;
		} else
			split = 0;
		memcpy(saa->dmadebi + split, saa->audbuf + saa->audhead,
			audbytes);
		saa->audhead += audbytes;
		saa->audhead &= 0xffff;
		debiwrite(saa, debAudio, (NewCard? IBM_MP2_AUD_FIFO :
			  IBM_MP2_AUD_FIFOW), 0, 2048);
		wake_up_interruptible(&saa->audq);
	/* if at least 1 block video waiting and video fifo isn't full */
	} else if (vidbytes >= 30720 && (debiread(saa, debNormal,
		IBM_MP2_FIFO, 2)) < 16384) {
		if (saa->vidhead > saa->vidtail)
			split = 524288 - saa->vidhead;
		else
			split = 0;
		vidbytes = 30720;
		if (split > 0 && split < 30720) {
			memcpy(saa->dmadebi, saa->vidbuf + saa->vidhead,
				split);
			saa->vidhead = 0;
			vidbytes -= split;
		} else
			split = 0;
		memcpy(saa->dmadebi + split, saa->vidbuf + saa->vidhead,
			vidbytes);
		saa->vidhead += vidbytes;
		saa->vidhead &= 0x7ffff;
		debiwrite(saa, debVideo, (NewCard ? IBM_MP2_FIFO :
			  IBM_MP2_FIFOW), 0, 30720);
		wake_up_interruptible(&saa->vidq);
	}
	saawrite(SAA7146_PSR_DEBI_S | SAA7146_PSR_PIN1, SAA7146_IER);
}

static void send_osd_data(struct saa7146 *saa)
{
	int size = saa->osdtail - saa->osdhead;
	if (size > 30720)
		size = 30720;
	/* ensure some multiple of 8 bytes is transferred */
	size = 8 * ((size + 8)>>3);
	if (size) {
		debiwrite(saa, debNormal, IBM_MP2_OSD_ADDR,
			  (saa->osdhead>>3), 2);
		memcpy(saa->dmadebi, &saa->osdbuf[saa->osdhead], size);
		saa->osdhead += size;
		/* block transfer of next 8 bytes to ~32k bytes */
		debiwrite(saa, debNormal, IBM_MP2_OSD_DATA, 0, size);
	}
	if (saa->osdhead >= saa->osdtail) {
		saa->osdhead = saa->osdtail = 0;
		debiwrite(saa, debNormal, IBM_MP2_MASK0, 0xc00c, 2);
	}
}

static irqreturn_t saa7146_irq(int irq, void *dev_id, struct pt_regs *regs)
{
	struct saa7146 *saa = (struct saa7146 *) dev_id;
	u32 stat, astat;
	int count;
	int handled = 0;

	count = 0;
	while (1) {
		/* get/clear interrupt status bits */
		stat = saaread(SAA7146_ISR);
		astat = stat & saaread(SAA7146_IER);
		if (!astat)
			break;
		handled = 1;
		saawrite(astat, SAA7146_ISR);
		if (astat & SAA7146_PSR_DEBI_S) {
			do_irq_send_data(saa);
		}
		if (astat & SAA7146_PSR_PIN1) {
			int istat;
			/* the following read will trigger DEBI_S */
			istat = debiread(saa, debNormal, IBM_MP2_HOST_INT, 2);
			if (istat & 1) {
				saawrite(0, SAA7146_IER);
				send_osd_data(saa);
				saawrite(SAA7146_PSR_DEBI_S |
					 SAA7146_PSR_PIN1, SAA7146_IER);
			}
			if (istat & 0x20) {	/* Video Start */
				saa->vidinfo.frame_count++;
			}
			if (istat & 0x400) {	/* Picture Start */
				/* update temporal reference */
			}
			if (istat & 0x200) {	/* Picture Resolution Change */
				/* read new resolution */
			}
			if (istat & 0x100) {	/* New User Data found */
				/* read new user data */
			}
			if (istat & 0x1000) {	/* new GOP/SMPTE */
				/* read new SMPTE */
			}
			if (istat & 0x8000) {	/* Sequence Start Code */
				/* reset frame counter, load sizes */
				saa->vidinfo.frame_count = 0;
				saa->vidinfo.h_size = 704;
				saa->vidinfo.v_size = 480;
#if 0
				if (saa->endmarkhead != saa->endmarktail) {
					saa->audhead = 
						saa->endmark[saa->endmarkhead];
					saa->endmarkhead++;
					if (saa->endmarkhead >= MAX_MARKS)
						saa->endmarkhead = 0;
				}
#endif
			}
			if (istat & 0x4000) {	/* Sequence Error Code */
				if (saa->endmarkhead != saa->endmarktail) {
					saa->audhead = 
						saa->endmark[saa->endmarkhead];
					saa->endmarkhead++;
					if (saa->endmarkhead >= MAX_MARKS)
						saa->endmarkhead = 0;
				}
			}
		}
#ifdef IDEBUG
		if (astat & SAA7146_PSR_PPEF) {
			IDEBUG(printk("stradis%d irq: PPEF\n", saa->nr));
		}
		if (astat & SAA7146_PSR_PABO) {
			IDEBUG(printk("stradis%d irq: PABO\n", saa->nr));
		}
		if (astat & SAA7146_PSR_PPED) {
			IDEBUG(printk("stradis%d irq: PPED\n", saa->nr));
		}
		if (astat & SAA7146_PSR_RPS_I1) {
			IDEBUG(printk("stradis%d irq: RPS_I1\n", saa->nr));
		}
		if (astat & SAA7146_PSR_RPS_I0) {
			IDEBUG(printk("stradis%d irq: RPS_I0\n", saa->nr));
		}
		if (astat & SAA7146_PSR_RPS_LATE1) {
			IDEBUG(printk("stradis%d irq: RPS_LATE1\n", saa->nr));
		}
		if (astat & SAA7146_PSR_RPS_LATE0) {
			IDEBUG(printk("stradis%d irq: RPS_LATE0\n", saa->nr));
		}
		if (astat & SAA7146_PSR_RPS_E1) {
			IDEBUG(printk("stradis%d irq: RPS_E1\n", saa->nr));
		}
		if (astat & SAA7146_PSR_RPS_E0) {
			IDEBUG(printk("stradis%d irq: RPS_E0\n", saa->nr));
		}
		if (astat & SAA7146_PSR_RPS_TO1) {
			IDEBUG(printk("stradis%d irq: RPS_TO1\n", saa->nr));
		}
		if (astat & SAA7146_PSR_RPS_TO0) {
			IDEBUG(printk("stradis%d irq: RPS_TO0\n", saa->nr));
		}
		if (astat & SAA7146_PSR_UPLD) {
			IDEBUG(printk("stradis%d irq: UPLD\n", saa->nr));
		}
		if (astat & SAA7146_PSR_DEBI_E) {
			IDEBUG(printk("stradis%d irq: DEBI_E\n", saa->nr));
		}
		if (astat & SAA7146_PSR_I2C_S) {
			IDEBUG(printk("stradis%d irq: I2C_S\n", saa->nr));
		}
		if (astat & SAA7146_PSR_I2C_E) {
			IDEBUG(printk("stradis%d irq: I2C_E\n", saa->nr));
		}
		if (astat & SAA7146_PSR_A2_IN) {
			IDEBUG(printk("stradis%d irq: A2_IN\n", saa->nr));
		}
		if (astat & SAA7146_PSR_A2_OUT) {
			IDEBUG(printk("stradis%d irq: A2_OUT\n", saa->nr));
		}
		if (astat & SAA7146_PSR_A1_IN) {
			IDEBUG(printk("stradis%d irq: A1_IN\n", saa->nr));
		}
		if (astat & SAA7146_PSR_A1_OUT) {
			IDEBUG(printk("stradis%d irq: A1_OUT\n", saa->nr));
		}
		if (astat & SAA7146_PSR_AFOU) {
			IDEBUG(printk("stradis%d irq: AFOU\n", saa->nr));
		}
		if (astat & SAA7146_PSR_V_PE) {
			IDEBUG(printk("stradis%d irq: V_PE\n", saa->nr));
		}
		if (astat & SAA7146_PSR_VFOU) {
			IDEBUG(printk("stradis%d irq: VFOU\n", saa->nr));
		}
		if (astat & SAA7146_PSR_FIDA) {
			IDEBUG(printk("stradis%d irq: FIDA\n", saa->nr));
		}
		if (astat & SAA7146_PSR_FIDB) {
			IDEBUG(printk("stradis%d irq: FIDB\n", saa->nr));
		}
		if (astat & SAA7146_PSR_PIN3) {
			IDEBUG(printk("stradis%d irq: PIN3\n", saa->nr));
		}
		if (astat & SAA7146_PSR_PIN2) {
			IDEBUG(printk("stradis%d irq: PIN2\n", saa->nr));
		}
		if (astat & SAA7146_PSR_PIN0) {
			IDEBUG(printk("stradis%d irq: PIN0\n", saa->nr));
		}
		if (astat & SAA7146_PSR_ECS) {
			IDEBUG(printk("stradis%d irq: ECS\n", saa->nr));
		}
		if (astat & SAA7146_PSR_EC3S) {
			IDEBUG(printk("stradis%d irq: EC3S\n", saa->nr));
		}
		if (astat & SAA7146_PSR_EC0S) {
			IDEBUG(printk("stradis%d irq: EC0S\n", saa->nr));
		}
#endif
		count++;
		if (count > 15)
			printk(KERN_WARNING "stradis%d: irq loop %d\n",
			       saa->nr, count);
		if (count > 20) {
			saawrite(0, SAA7146_IER);
			printk(KERN_ERR
			       "stradis%d: IRQ loop cleared\n", saa->nr);
		}
	}
	return IRQ_RETVAL(handled);
}

static int ibm_send_command(struct saa7146 *saa,
			    int command, int data, int chain)
{
	int i;

	if (chain)
		debiwrite(saa, debNormal, IBM_MP2_COMMAND, (command << 1) | 1, 2);
	else
		debiwrite(saa, debNormal, IBM_MP2_COMMAND, command << 1, 2);
	debiwrite(saa, debNormal, IBM_MP2_CMD_DATA, data, 2);
	debiwrite(saa, debNormal, IBM_MP2_CMD_STAT, 1, 2);
	for (i = 0; i < 100 &&
	     (debiread(saa, debNormal, IBM_MP2_CMD_STAT, 2) & 1); i++)
		schedule();
	if (i == 100)
		return -1;
	return 0;
}

static void cs4341_setlevel(struct saa7146 *saa, int left, int right)
{
	I2CWrite(saa, 0x22, 0x03, left > 94 ? 94 : left, 2);
	I2CWrite(saa, 0x22, 0x04, right > 94 ? 94 : right, 2);
}

static void initialize_cs4341(struct saa7146 *saa)
{
	int i;
	for (i = 0; i < 200; i++) {
		/* auto mute off, power on, no de-emphasis */
		/* I2S data up to 24-bit 64xFs internal SCLK */
		I2CWrite(saa, 0x22, 0x01, 0x11, 2);
		/* ATAPI mixer settings */
		I2CWrite(saa, 0x22, 0x02, 0x49, 2);
		/* attenuation left 3db */
		I2CWrite(saa, 0x22, 0x03, 0x00, 2);
		/* attenuation right 3db */
		I2CWrite(saa, 0x22, 0x04, 0x00, 2);
		I2CWrite(saa, 0x22, 0x01, 0x10, 2);
		if (I2CRead(saa, 0x22, 0x02, 1) == 0x49)
			break;
		schedule();
	}
	printk("stradis%d: CS4341 initialized (%d)\n", saa->nr, i);
	return;
}

static void initialize_cs8420(struct saa7146 *saa, int pro)
{
	int i;
	u8 *sequence;
	if (pro)
		sequence = mode8420pro;
	else
		sequence = mode8420con;
	for (i = 0; i < INIT8420LEN; i++)
		I2CWrite(saa, 0x20, init8420[i * 2],
			 init8420[i * 2 + 1], 2);
	for (i = 0; i < MODE8420LEN; i++)
		I2CWrite(saa, 0x20, sequence[i * 2],
			 sequence[i * 2 + 1], 2);
	printk("stradis%d: CS8420 initialized\n", saa->nr);
}

static void initialize_saa7121(struct saa7146 *saa, int dopal)
{
	int i, mod;
	u8 *sequence;
	if (dopal)
		sequence = init7121pal;
	else
		sequence = init7121ntsc;
	mod = saaread(SAA7146_PSR) & 0x08;
	/* initialize PAL/NTSC video encoder */
	for (i = 0; i < INIT7121LEN; i++) {
		if (NewCard) {	/* handle new card encoder differences */
			if (sequence[i*2] == 0x3a)
				I2CWrite(saa, 0x88, 0x3a, 0x13, 2);
			else if (sequence[i*2] == 0x6b)
				I2CWrite(saa, 0x88, 0x6b, 0x20, 2);
			else if (sequence[i*2] == 0x6c)
				I2CWrite(saa, 0x88, 0x6c,
					 dopal ? 0x09 : 0xf5, 2);
			else if (sequence[i*2] == 0x6d)
				I2CWrite(saa, 0x88, 0x6d,
					 dopal ? 0x20 : 0x00, 2);
			else if (sequence[i*2] == 0x7a)
				I2CWrite(saa, 0x88, 0x7a,
					 dopal ? (PALFirstActive - 1) :
					 (NTSCFirstActive - 4), 2);
			else if (sequence[i*2] == 0x7b)
				I2CWrite(saa, 0x88, 0x7b,
					 dopal ? PALLastActive :
					 NTSCLastActive, 2);
			else I2CWrite(saa, 0x88, sequence[i * 2],
				 sequence[i * 2 + 1], 2);
		} else {
			if (sequence[i*2] == 0x6b && mod)
				I2CWrite(saa, 0x88, 0x6b, 
					(sequence[i * 2 + 1] ^ 0x09), 2);
			else if (sequence[i*2] == 0x7a)
				I2CWrite(saa, 0x88, 0x7a,
					 dopal ? (PALFirstActive - 1) :
					 (NTSCFirstActive - 4), 2);
			else if (sequence[i*2] == 0x7b)
				I2CWrite(saa, 0x88, 0x7b,
					 dopal ? PALLastActive :
					 NTSCLastActive, 2);
			else
				I2CWrite(saa, 0x88, sequence[i * 2],
					 sequence[i * 2 + 1], 2);
		}
	}
}

static void set_genlock_offset(struct saa7146 *saa, int noffset)
{
	int nCode;
	int PixelsPerLine = 858;
	if (CurrentMode == VIDEO_MODE_PAL)
		PixelsPerLine = 864;
	if (noffset > 500)
		noffset = 500;
	else if (noffset < -500)
		noffset = -500;
	nCode = noffset + 0x100;
	if (nCode == 1)
		nCode = 0x401;
	else if (nCode < 1) nCode = 0x400 + PixelsPerLine + nCode;
	debiwrite(saa, debNormal, XILINX_GLDELAY, nCode, 2);
}

static void set_out_format(struct saa7146 *saa, int mode)
{
	initialize_saa7121(saa, (mode == VIDEO_MODE_NTSC ? 0 : 1));
	saa->boardcfg[2] = mode;
	/* do not adjust analog video parameters here, use saa7121 init */
	/* you will affect the SDI output on the new card */
	if (mode == VIDEO_MODE_PAL) {		/* PAL */
		debiwrite(saa, debNormal, XILINX_CTL0, 0x0808, 2);
		mdelay(50);
		saawrite(0x012002c0, SAA7146_NUM_LINE_BYTE1);
		if (NewCard) {
			debiwrite(saa, debNormal, IBM_MP2_DISP_MODE,
				  0xe100, 2);
			mdelay(50);
		}
		debiwrite(saa, debNormal, IBM_MP2_DISP_MODE,
			  NewCard ? 0xe500: 0x6500, 2);
		debiwrite(saa, debNormal, IBM_MP2_DISP_DLY,
			  (1 << 8) |
			  (NewCard ? PALFirstActive : PALFirstActive-6), 2);
	} else {		/* NTSC */
		debiwrite(saa, debNormal, XILINX_CTL0, 0x0800, 2);
		mdelay(50);
		saawrite(0x00f002c0, SAA7146_NUM_LINE_BYTE1);
		debiwrite(saa, debNormal, IBM_MP2_DISP_MODE,
			  NewCard ? 0xe100: 0x6100, 2);
		debiwrite(saa, debNormal, IBM_MP2_DISP_DLY,
			  (1 << 8) |
			  (NewCard ? NTSCFirstActive : NTSCFirstActive-6), 2);
	}
}


/* Intialize bitmangler to map from a byte value to the mangled word that
 * must be output to program the Xilinx part through the DEBI port.
 * Xilinx Data Bit->DEBI Bit: 0->15 1->7 2->6 3->12 4->11 5->2 6->1 7->0
 * transfer FPGA code, init IBM chip, transfer IBM microcode
 * rev2 card mangles: 0->7 1->6 2->5 3->4 4->3 5->2 6->1 7->0
 */
static u16 bitmangler[256];

static int initialize_fpga(struct video_code *bitdata)
{
	int i, num, startindex, failure = 0, loadtwo, loadfile = 0;
	u16 *dmabuf;
	u8 *newdma;
	struct saa7146 *saa;

	/* verify fpga code */
	for (startindex = 0; startindex < bitdata->datasize; startindex++)
		if (bitdata->data[startindex] == 255)
			break;
	if (startindex == bitdata->datasize) {
		printk(KERN_INFO "stradis: bad fpga code\n");
		return -1;
	}
	/* initialize all detected cards */
	for (num = 0; num < saa_num; num++) {
		saa = &saa7146s[num];
		if (saa->boardcfg[0] > 20)
				continue;	/* card was programmed */
		loadtwo = (saa->boardcfg[18] & 0x10);
		if (!NewCard)	/* we have an old board */
			for (i = 0; i < 256; i++)
			    bitmangler[i] = ((i & 0x01) << 15) |
				((i & 0x02) << 6) | ((i & 0x04) << 4) |
				((i & 0x08) << 9) | ((i & 0x10) << 7) |
				((i & 0x20) >> 3) | ((i & 0x40) >> 5) |
				((i & 0x80) >> 7);
		else	/* else we have a new board */
			for (i = 0; i < 256; i++)
			    bitmangler[i] = ((i & 0x01) << 7) |
				((i & 0x02) << 5) | ((i & 0x04) << 3) |
				((i & 0x08) << 1) | ((i & 0x10) >> 1) |
				((i & 0x20) >> 3) | ((i & 0x40) >> 5) |
				((i & 0x80) >> 7);

		dmabuf = (u16 *) saa->dmadebi;
		newdma = (u8 *) saa->dmadebi;
		if (NewCard) {	/* SDM2xxx */
			if (!strncmp(bitdata->loadwhat, "decoder2", 8))
				continue;	/* fpga not for this card */
			if (!strncmp(&saa->boardcfg[42],
				     bitdata->loadwhat, 8)) {
				loadfile = 1;
			} else if (loadtwo && !strncmp(&saa->boardcfg[19],
				   bitdata->loadwhat, 8)) {
				loadfile = 2;
			} else if (!saa->boardcfg[42] &&	/* special */
				   !strncmp("decxl", bitdata->loadwhat, 8)) {
				loadfile = 1;
			} else
				continue;	/* fpga not for this card */
			if (loadfile != 1 && loadfile != 2) {
				continue;	/* skip to next card */
			}
			if (saa->boardcfg[0] && loadfile == 1 )
				continue;	/* skip to next card */
			if (saa->boardcfg[0] != 1 && loadfile == 2)
				continue;	/* skip to next card */
			saa->boardcfg[0]++;	/* mark fpga handled */
			printk("stradis%d: loading %s\n", saa->nr,
				bitdata->loadwhat);
			if (loadtwo && loadfile == 2)
				goto send_fpga_stuff;
			/* turn on the Audio interface to set PROG low */
			saawrite(0x00400040, SAA7146_GPIO_CTRL);
			saaread(SAA7146_PSR);	/* ensure posted write */
			/* wait for everyone to reset */
			mdelay(10);
			saawrite(0x00400000, SAA7146_GPIO_CTRL);
		} else {	/* original card */
			if (strncmp(bitdata->loadwhat, "decoder2", 8))
				continue;	/* fpga not for this card */
			/* Pull the Xilinx PROG signal WS3 low */
			saawrite(0x02000200, SAA7146_MC1);
			/* Turn on the Audio interface so can set PROG low */
			saawrite(0x000000c0, SAA7146_ACON1);
			/* Pull the Xilinx INIT signal (GPIO2) low */
			saawrite(0x00400000, SAA7146_GPIO_CTRL);
			/* Make sure everybody resets */
			saaread(SAA7146_PSR);	/* ensure posted write */
			mdelay(10);
			/* Release the Xilinx PROG signal */
			saawrite(0x00000000, SAA7146_ACON1);
			/* Turn off the Audio interface */
			saawrite(0x02000000, SAA7146_MC1);
		}
		/* Release Xilinx INIT signal (WS2) */
		saawrite(0x00000000, SAA7146_GPIO_CTRL);
		/* Wait for the INIT to go High */
		for (i = 0; i < 10000 &&
		     !(saaread(SAA7146_PSR) & SAA7146_PSR_PIN2); i++)
			schedule();
		if (i == 1000) {
			printk(KERN_INFO "stradis%d: no fpga INIT\n", saa->nr);
			return -1;
		}
send_fpga_stuff:
		if (NewCard) {
			for (i = startindex; i < bitdata->datasize; i++)
				newdma[i - startindex] =
					bitmangler[bitdata->data[i]];
			debiwrite(saa, 0x01420000, 0, 0,
				((bitdata->datasize - startindex) + 5));
			if (loadtwo) {
				if (loadfile == 1) {
					printk("stradis%d: "
						"awaiting 2nd FPGA bitfile\n",
						saa->nr);
					continue;	/* skip to next card */
				}

			}
		} else {
			for (i = startindex; i < bitdata->datasize; i++)
				dmabuf[i - startindex] =
					bitmangler[bitdata->data[i]];
			debiwrite(saa, 0x014a0000, 0, 0,
				((bitdata->datasize - startindex) + 5) * 2);
		}
		for (i = 0; i < 1000 &&
		     !(saaread(SAA7146_PSR) & SAA7146_PSR_PIN2); i++)
			schedule();
		if (i == 1000) {
			printk(KERN_INFO "stradis%d: FPGA load failed\n",
			       saa->nr);
			failure++;
			continue;
		}
		if (!NewCard) {
			/* Pull the Xilinx INIT signal (GPIO2) low */
			saawrite(0x00400000, SAA7146_GPIO_CTRL);
			saaread(SAA7146_PSR);	/* ensure posted write */
			mdelay(2);
			saawrite(0x00000000, SAA7146_GPIO_CTRL);
			mdelay(2);
		}
		printk(KERN_INFO "stradis%d: FPGA Loaded\n", saa->nr);
		saa->boardcfg[0] = 26;	/* mark fpga programmed */
		/* set VXCO to its lowest frequency */
		debiwrite(saa, debNormal, XILINX_PWM, 0, 2);
		if (NewCard) {
			/* mute CS3310 */
			if (HaveCS3310)
				debiwrite(saa, debNormal, XILINX_CS3310_CMPLT,
					  0, 2);
			/* set VXCO to PWM mode, release reset, blank on */
			debiwrite(saa, debNormal, XILINX_CTL0, 0xffc4, 2);
			mdelay(10);
			/* unmute CS3310 */
			if (HaveCS3310)
				debiwrite(saa, debNormal, XILINX_CTL0,
					  0x2020, 2);
		}
		/* set source Black */
		debiwrite(saa, debNormal, XILINX_CTL0, 0x1707, 2);
		saa->boardcfg[4] = 22;	/* set NTSC First Active Line */
		saa->boardcfg[5] = 23;	/* set PAL First Active Line */
		saa->boardcfg[54] = 2;	/* set NTSC Last Active Line - 256 */
		saa->boardcfg[55] = 54;	/* set PAL Last Active Line - 256 */
		set_out_format(saa, VIDEO_MODE_NTSC);
		mdelay(50);
		/* begin IBM chip init */
		debiwrite(saa, debNormal, IBM_MP2_CHIP_CONTROL, 4, 2);
		saaread(SAA7146_PSR);	/* wait for reset */
		mdelay(5);
		debiwrite(saa, debNormal, IBM_MP2_CHIP_CONTROL, 0, 2);
		debiread(saa, debNormal, IBM_MP2_CHIP_CONTROL, 2);
		debiwrite(saa, debNormal, IBM_MP2_CHIP_CONTROL, 0x10, 2);
		debiwrite(saa, debNormal, IBM_MP2_CMD_ADDR, 0, 2);
		debiwrite(saa, debNormal, IBM_MP2_CHIP_MODE, 0x2e, 2);
		if (NewCard) {
			mdelay(5);
			/* set i2s rate converter to 48KHz */
			debiwrite(saa, debNormal, 0x80c0, 6, 2);
			/* we must init CS8420 first since rev b pulls i2s */
			/* master clock low and CS4341 needs i2s master to */
			/* run the i2c port. */
			if (HaveCS8420) {
				/* 0=consumer, 1=pro */
				initialize_cs8420(saa, 0);
			}
			mdelay(5);
			if (HaveCS4341)
				initialize_cs4341(saa);
		}
		debiwrite(saa, debNormal, IBM_MP2_INFC_CTL, 0x48, 2);
		debiwrite(saa, debNormal, IBM_MP2_BEEP_CTL, 0xa000, 2);
		debiwrite(saa, debNormal, IBM_MP2_DISP_LBOR, 0, 2);
		debiwrite(saa, debNormal, IBM_MP2_DISP_TBOR, 0, 2);
		if (NewCard)
			set_genlock_offset(saa, 0);
		debiwrite(saa, debNormal, IBM_MP2_FRNT_ATTEN, 0, 2);
#if 0
		/* enable genlock */
		debiwrite(saa, debNormal, XILINX_CTL0, 0x8000, 2);
#else
		/* disable genlock */
		debiwrite(saa, debNormal, XILINX_CTL0, 0x8080, 2);
#endif
	}
	return failure;
}

static int do_ibm_reset(struct saa7146 *saa)
{
	/* failure if decoder not previously programmed */
	if (saa->boardcfg[0] < 37)
		return -EIO;
	/* mute CS3310 */
	if (HaveCS3310)
		debiwrite(saa, debNormal, XILINX_CS3310_CMPLT, 0, 2);
	/* disable interrupts */
	saawrite(0, SAA7146_IER);
	saa->audhead = saa->audtail = 0;
	saa->vidhead = saa->vidtail = 0;
	/* tristate debi bus, disable debi transfers */
	saawrite(0x00880000, SAA7146_MC1);
	/* ensure posted write */
	saaread(SAA7146_MC1);
	mdelay(50);
	/* re-enable debi transfers */
	saawrite(0x00880088, SAA7146_MC1);
	/* set source Black */
	debiwrite(saa, debNormal, XILINX_CTL0, 0x1707, 2);
	/* begin IBM chip init */
	set_out_format(saa, CurrentMode);
	debiwrite(saa, debNormal, IBM_MP2_CHIP_CONTROL, 4, 2);
	saaread(SAA7146_PSR);	/* wait for reset */
	mdelay(5);
	debiwrite(saa, debNormal, IBM_MP2_CHIP_CONTROL, 0, 2);
	debiread(saa, debNormal, IBM_MP2_CHIP_CONTROL, 2);
	debiwrite(saa, debNormal, IBM_MP2_CHIP_CONTROL, ChipControl, 2);
	debiwrite(saa, debNormal, IBM_MP2_CHIP_MODE, 0x2e, 2);
	if (NewCard) {
		mdelay(5);
		/* set i2s rate converter to 48KHz */
		debiwrite(saa, debNormal, 0x80c0, 6, 2);
		/* we must init CS8420 first since rev b pulls i2s */
		/* master clock low and CS4341 needs i2s master to */
		/* run the i2c port. */
		if (HaveCS8420) {
			/* 0=consumer, 1=pro */
			initialize_cs8420(saa, 1);
		}
		mdelay(5);
		if (HaveCS4341)
			initialize_cs4341(saa);
	}
	debiwrite(saa, debNormal, IBM_MP2_INFC_CTL, 0x48, 2);
	debiwrite(saa, debNormal, IBM_MP2_BEEP_CTL, 0xa000, 2);
	debiwrite(saa, debNormal, IBM_MP2_DISP_LBOR, 0, 2);
	debiwrite(saa, debNormal, IBM_MP2_DISP_TBOR, 0, 2);
	if (NewCard)
		set_genlock_offset(saa, 0);
	debiwrite(saa, debNormal, IBM_MP2_FRNT_ATTEN, 0, 2);
	debiwrite(saa, debNormal, IBM_MP2_OSD_SIZE, 0x2000, 2);
	debiwrite(saa, debNormal, IBM_MP2_AUD_CTL, 0x4552, 2);
	if (ibm_send_command(saa, IBM_MP2_CONFIG_DECODER,
		(ChipControl == 0x43 ? 0xe800 : 0xe000), 1)) {
		printk(KERN_ERR "stradis%d: IBM config failed\n", saa->nr);
	}
	if (HaveCS3310) {
		int i = CS3310MaxLvl;
		debiwrite(saa, debNormal, XILINX_CS3310_CMPLT, ((i<<8)|i), 2);
	}
	/* start video decoder */
	debiwrite(saa, debNormal, IBM_MP2_CHIP_CONTROL, ChipControl, 2);
	/* 256k vid, 3520 bytes aud */
	debiwrite(saa, debNormal, IBM_MP2_RB_THRESHOLD, 0x4037, 2);
	debiwrite(saa, debNormal, IBM_MP2_AUD_CTL, 0x4573, 2);
	ibm_send_command(saa, IBM_MP2_PLAY, 0, 0);
	/* enable buffer threshold irq */
	debiwrite(saa, debNormal, IBM_MP2_MASK0, 0xc00c, 2);
	/* clear pending interrupts */
	debiread(saa, debNormal, IBM_MP2_HOST_INT, 2);
	debiwrite(saa, debNormal, XILINX_CTL0, 0x1711, 2);
	return 0;
}

/* load the decoder microcode */
static int initialize_ibmmpeg2(struct video_code *microcode)
{
	int i, num;
	struct saa7146 *saa;

	for (num = 0; num < saa_num; num++) {
		saa = &saa7146s[num];
		/* check that FPGA is loaded */
		debiwrite(saa, debNormal, IBM_MP2_OSD_SIZE, 0xa55a, 2);
		if ((i = debiread(saa, debNormal, IBM_MP2_OSD_SIZE, 2)) !=
		     0xa55a) {
			printk(KERN_INFO "stradis%d: %04x != 0xa55a\n",
				saa->nr, i);
#if 0
			return -1;
#endif
		}
		if (!strncmp(microcode->loadwhat, "decoder.vid", 11)) {
			if (saa->boardcfg[0] > 27)
				continue;	/* skip to next card */
			/* load video control store */
			saa->boardcfg[1] = 0x13;  /* no-sync default */
			debiwrite(saa, debNormal, IBM_MP2_WR_PROT, 1, 2);
			debiwrite(saa, debNormal, IBM_MP2_PROC_IADDR, 0, 2);
			for (i = 0; i < microcode->datasize / 2; i++)
				debiwrite(saa, debNormal, IBM_MP2_PROC_IDATA,
					(microcode->data[i * 2] << 8) |
					 microcode->data[i * 2 + 1], 2);
			debiwrite(saa, debNormal, IBM_MP2_PROC_IADDR, 0, 2);
			debiwrite(saa, debNormal, IBM_MP2_WR_PROT, 0, 2);
			debiwrite(saa, debNormal, IBM_MP2_CHIP_CONTROL,
				  ChipControl, 2);
			saa->boardcfg[0] = 28;
		}
		if (!strncmp(microcode->loadwhat, "decoder.aud", 11)) {
			if (saa->boardcfg[0] > 35)
				continue;	/* skip to next card */
			/* load audio control store */
			debiwrite(saa, debNormal, IBM_MP2_WR_PROT, 1, 2);
			debiwrite(saa, debNormal, IBM_MP2_AUD_IADDR, 0, 2);
			for (i = 0; i < microcode->datasize; i++)
				debiwrite(saa, debNormal, IBM_MP2_AUD_IDATA,
					microcode->data[i], 1);
			debiwrite(saa, debNormal, IBM_MP2_AUD_IADDR, 0, 2);
			debiwrite(saa, debNormal, IBM_MP2_WR_PROT, 0, 2);
			debiwrite(saa, debNormal, IBM_MP2_OSD_SIZE, 0x2000, 2);
			debiwrite(saa, debNormal, IBM_MP2_AUD_CTL, 0x4552, 2);
			if (ibm_send_command(saa, IBM_MP2_CONFIG_DECODER,
			    0xe000, 1)) {
				printk(KERN_ERR
				       "stradis%d: IBM config failed\n",
				       saa->nr);
				return -1;
			}
			/* set PWM to center value */
			if (NewCard) {
				debiwrite(saa, debNormal, XILINX_PWM,
					  saa->boardcfg[14] +
					  (saa->boardcfg[13]<<8), 2);
			} else
				debiwrite(saa, debNormal, XILINX_PWM,
					  0x46, 2);
			if (HaveCS3310) {
				i = CS3310MaxLvl;
				debiwrite(saa, debNormal,
					XILINX_CS3310_CMPLT, ((i<<8)|i), 2);
			}
			printk(KERN_INFO
			       "stradis%d: IBM MPEGCD%d Initialized\n",
			       saa->nr, 18 + (debiread(saa, debNormal,
			       IBM_MP2_CHIP_CONTROL, 2) >> 12));
			/* start video decoder */
			debiwrite(saa, debNormal, IBM_MP2_CHIP_CONTROL,
				ChipControl, 2);
			debiwrite(saa, debNormal, IBM_MP2_RB_THRESHOLD,
				0x4037, 2);	/* 256k vid, 3520 bytes aud */
			debiwrite(saa, debNormal, IBM_MP2_AUD_CTL, 0x4573, 2);
			ibm_send_command(saa, IBM_MP2_PLAY, 0, 0);
			/* enable buffer threshold irq */
			debiwrite(saa, debNormal, IBM_MP2_MASK0, 0xc00c, 2);
			debiread(saa, debNormal, IBM_MP2_HOST_INT, 2);
			/* enable gpio irq */
			saawrite(0x00002000, SAA7146_GPIO_CTRL);
			/* enable decoder output to HPS */
			debiwrite(saa, debNormal, XILINX_CTL0, 0x1711, 2);
			saa->boardcfg[0] = 37;
		}
	}
	return 0;
}

static u32 palette2fmt[] =
{				/* some of these YUV translations are wrong */
  0xffffffff, 0x86000000, 0x87000000, 0x80000000, 0x8100000, 0x82000000,
  0x83000000, 0x00000000, 0x03000000, 0x03000000, 0x0a00000, 0x03000000,
  0x06000000, 0x00000000, 0x03000000, 0x0a000000, 0x0300000
};
static int bpp2fmt[4] =
{
	VIDEO_PALETTE_HI240, VIDEO_PALETTE_RGB565, VIDEO_PALETTE_RGB24,
	VIDEO_PALETTE_RGB32
};

/* I wish I could find a formula to calculate these... */
static u32 h_prescale[64] =
{
  0x10000000, 0x18040202, 0x18080000, 0x380c0606, 0x38100204, 0x38140808,
  0x38180000, 0x381c0000, 0x3820161c, 0x38242a3b, 0x38281230, 0x382c4460,
  0x38301040, 0x38340080, 0x38380000, 0x383c0000, 0x3840fefe, 0x3844ee9f,
  0x3848ee9f, 0x384cee9f, 0x3850ee9f, 0x38542a3b, 0x38581230, 0x385c0000,
  0x38600000, 0x38640000, 0x38680000, 0x386c0000, 0x38700000, 0x38740000,
  0x38780000, 0x387c0000, 0x30800000, 0x38840000, 0x38880000, 0x388c0000,
  0x38900000, 0x38940000, 0x38980000, 0x389c0000, 0x38a00000, 0x38a40000,
  0x38a80000, 0x38ac0000, 0x38b00000, 0x38b40000, 0x38b80000, 0x38bc0000,
  0x38c00000, 0x38c40000, 0x38c80000, 0x38cc0000, 0x38d00000, 0x38d40000,
  0x38d80000, 0x38dc0000, 0x38e00000, 0x38e40000, 0x38e80000, 0x38ec0000,
  0x38f00000, 0x38f40000, 0x38f80000, 0x38fc0000,
};
static u32 v_gain[64] =
{
  0x016000ff, 0x016100ff, 0x016100ff, 0x016200ff, 0x016200ff, 0x016200ff,
  0x016200ff, 0x016300ff, 0x016300ff, 0x016300ff, 0x016300ff, 0x016300ff,
  0x016300ff, 0x016300ff, 0x016300ff, 0x016400ff, 0x016400ff, 0x016400ff,
  0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff,
  0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff,
  0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff,
  0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff,
  0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff,
  0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff,
  0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff,
  0x016400ff, 0x016400ff, 0x016400ff, 0x016400ff,
};


static void saa7146_set_winsize(struct saa7146 *saa)
{
	u32 format;
	int offset, yacl, ysci;
	saa->win.color_fmt = format =
	    (saa->win.depth == 15) ? palette2fmt[VIDEO_PALETTE_RGB555] :
	    palette2fmt[bpp2fmt[(saa->win.bpp - 1) & 3]];
	offset = saa->win.x * saa->win.bpp + saa->win.y * saa->win.bpl;
	saawrite(saa->win.vidadr + offset, SAA7146_BASE_EVEN1);
	saawrite(saa->win.vidadr + offset + saa->win.bpl, SAA7146_BASE_ODD1);
	saawrite(saa->win.bpl * 2, SAA7146_PITCH1);
	saawrite(saa->win.vidadr + saa->win.bpl * saa->win.sheight,
		 SAA7146_PROT_ADDR1);
	saawrite(0, SAA7146_PAGE1);
	saawrite(format|0x60, SAA7146_CLIP_FORMAT_CTRL);
	offset = (704 / (saa->win.width - 1)) & 0x3f;
	saawrite(h_prescale[offset], SAA7146_HPS_H_PRESCALE);
	offset = (720896 / saa->win.width) / (offset + 1);
	saawrite((offset<<12)|0x0c, SAA7146_HPS_H_SCALE);
	if (CurrentMode == VIDEO_MODE_NTSC) {
		yacl = /*(480 / saa->win.height - 1) & 0x3f*/ 0;
		ysci = 1024 - (saa->win.height * 1024 / 480);
	} else {
		yacl = /*(576 / saa->win.height - 1) & 0x3f*/ 0;
		ysci = 1024 - (saa->win.height * 1024 / 576);
	}
	saawrite((1<<31)|(ysci<<21)|(yacl<<15), SAA7146_HPS_V_SCALE);
	saawrite(v_gain[yacl], SAA7146_HPS_V_GAIN);
	saawrite(((SAA7146_MC2_UPLD_DMA1 | SAA7146_MC2_UPLD_HPS_V |
		   SAA7146_MC2_UPLD_HPS_H) << 16) | (SAA7146_MC2_UPLD_DMA1 |
		   SAA7146_MC2_UPLD_HPS_V | SAA7146_MC2_UPLD_HPS_H),
		   SAA7146_MC2);
}

/* clip_draw_rectangle(cm,x,y,w,h) -- handle clipping an area
 * bitmap is fixed width, 128 bytes (1024 pixels represented) 
 * arranged most-sigificant-bit-left in 32-bit words 
 * based on saa7146 clipping hardware, it swaps bytes if LE 
 * much of this makes up for egcs brain damage -- so if you
 * are wondering "why did he do this?" it is because the C
 * was adjusted to generate the optimal asm output without
 * writing non-portable __asm__ directives.
 */

static void clip_draw_rectangle(u32 *clipmap, int x, int y, int w, int h)
{
	register int startword, endword;
	register u32 bitsleft, bitsright;
	u32 *temp;
	if (x < 0) {
		w += x;
		x = 0;
	}
	if (y < 0) {
		h += y;
		y = 0;
	}
	if (w <= 0 || h <= 0 || x > 1023 || y > 639)
		return;		/* throw away bad clips */
	if (x + w > 1024)
		w = 1024 - x;
	if (y + h > 640)
		h = 640 - y;
	startword = (x >> 5);
	endword = ((x + w) >> 5);
	bitsleft = (0xffffffff >> (x & 31));
	bitsright = (0xffffffff << (~((x + w) - (endword<<5))));
	temp = &clipmap[(y<<5) + startword];
	w = endword - startword;
	if (!w) {
		bitsleft |= bitsright;
		for (y = 0; y < h; y++) {
			*temp |= bitsleft;
			temp += 32;
		}
	} else {
		for (y = 0; y < h; y++) {
			*temp++ |= bitsleft;
			for (x = 1; x < w; x++)
				*temp++ = 0xffffffff;
			*temp |= bitsright;
			temp += (32 - w);
		}
	}
}

static void make_clip_tab(struct saa7146 *saa, struct video_clip *cr, int ncr)
{
	int i, width, height;
	u32 *clipmap;

	clipmap = saa->dmavid2;
	if((width=saa->win.width)>1023)
		width = 1023;		/* sanity check */
	if((height=saa->win.height)>640)
		height = 639;		/* sanity check */
	if (ncr > 0) {	/* rectangles pased */
		/* convert rectangular clips to a bitmap */
		memset(clipmap, 0, VIDEO_CLIPMAP_SIZE); /* clear map */
		for (i = 0; i < ncr; i++)
			clip_draw_rectangle(clipmap, cr[i].x, cr[i].y,
				cr[i].width, cr[i].height);
	}
	/* clip against viewing window AND screen 
	   so we do not have to rely on the user program
	 */
	clip_draw_rectangle(clipmap,(saa->win.x+width>saa->win.swidth) ?
		(saa->win.swidth-saa->win.x) : width, 0, 1024, 768);
	clip_draw_rectangle(clipmap,0,(saa->win.y+height>saa->win.sheight) ?
		(saa->win.sheight-saa->win.y) : height,1024,768);
	if (saa->win.x<0)
		clip_draw_rectangle(clipmap, 0, 0, -(saa->win.x), 768);
	if (saa->win.y<0)
		clip_draw_rectangle(clipmap, 0, 0, 1024, -(saa->win.y));
}

static int saa_ioctl(struct inode *inode, struct file *file,
		     unsigned int cmd, unsigned long argl)
{
	struct saa7146 *saa = file->private_data;
	void __user *arg = (void __user *)argl;

	switch (cmd) {
	case VIDIOCGCAP:
		{
			struct video_capability b;
			strcpy(b.name, saa->video_dev.name);
			b.type = VID_TYPE_CAPTURE |
			    VID_TYPE_OVERLAY |
			    VID_TYPE_CLIPPING |
			    VID_TYPE_FRAMERAM |
			    VID_TYPE_SCALES;
			b.channels = 1;
			b.audios = 1;
			b.maxwidth = 768;
			b.maxheight = 576;
			b.minwidth = 32;
			b.minheight = 32;
			if (copy_to_user(arg, &b, sizeof(b)))
				return -EFAULT;
			return 0;
		}
	case VIDIOCGPICT:
		{
			struct video_picture p = saa->picture;
			if (saa->win.depth == 8)
				p.palette = VIDEO_PALETTE_HI240;
			if (saa->win.depth == 15)
				p.palette = VIDEO_PALETTE_RGB555;
			if (saa->win.depth == 16)
				p.palette = VIDEO_PALETTE_RGB565;
			if (saa->win.depth == 24)
				p.palette = VIDEO_PALETTE_RGB24;
			if (saa->win.depth == 32)
				p.palette = VIDEO_PALETTE_RGB32;
			if (copy_to_user(arg, &p, sizeof(p)))
				return -EFAULT;
			return 0;
		}
	case VIDIOCSPICT:
		{
			struct video_picture p;
			u32 format;
			if (copy_from_user(&p, arg, sizeof(p)))
				return -EFAULT;
			if (p.palette < sizeof(palette2fmt) / sizeof(u32)) {
				format = palette2fmt[p.palette];
				saa->win.color_fmt = format;
				saawrite(format|0x60, SAA7146_CLIP_FORMAT_CTRL);
			}
			saawrite(((p.brightness & 0xff00) << 16) |
				 ((p.contrast & 0xfe00) << 7) |
			     ((p.colour & 0xfe00) >> 9), SAA7146_BCS_CTRL);
			saa->picture = p;
			/* upload changed registers */
			saawrite(((SAA7146_MC2_UPLD_HPS_H |
				 SAA7146_MC2_UPLD_HPS_V) << 16) |
				SAA7146_MC2_UPLD_HPS_H | SAA7146_MC2_UPLD_HPS_V,
				 SAA7146_MC2);
			return 0;
		}
	case VIDIOCSWIN:
		{
			struct video_window vw;
			struct video_clip *vcp = NULL;

			if (copy_from_user(&vw, arg, sizeof(vw)))
				return -EFAULT;

			if (vw.flags || vw.width < 16 || vw.height < 16) {	/* stop capture */
				saawrite((SAA7146_MC1_TR_E_1 << 16), SAA7146_MC1);
				return -EINVAL;
			}
			if (saa->win.bpp < 4) {		/* 32-bit align start and adjust width */
				int i = vw.x;
				vw.x = (vw.x + 3) & ~3;
				i = vw.x - i;
				vw.width -= i;
			}
			saa->win.x = vw.x;
			saa->win.y = vw.y;
			saa->win.width = vw.width;
			if (saa->win.width > 768)
				saa->win.width = 768;
			saa->win.height = vw.height;
			if (CurrentMode == VIDEO_MODE_NTSC) {
				if (saa->win.height > 480)
					saa->win.height = 480;
			} else {
				if (saa->win.height > 576)
					saa->win.height = 576;
			}

			/* stop capture */
			saawrite((SAA7146_MC1_TR_E_1 << 16), SAA7146_MC1);
			saa7146_set_winsize(saa);

			/*
			 *    Do any clips.
			 */
			if (vw.clipcount < 0) {
				if (copy_from_user(saa->dmavid2, vw.clips,
						   VIDEO_CLIPMAP_SIZE))
					return -EFAULT;
			}
			else if (vw.clipcount > 16384) {
				return -EINVAL;
			} else if (vw.clipcount > 0) {
				if ((vcp = vmalloc(sizeof(struct video_clip) *
					        (vw.clipcount))) == NULL)
					 return -ENOMEM;
				if (copy_from_user(vcp, vw.clips,
					      sizeof(struct video_clip) *
						   vw.clipcount)) {
					vfree(vcp);
					return -EFAULT;
				}
			} else	/* nothing clipped */
				memset(saa->dmavid2, 0, VIDEO_CLIPMAP_SIZE);
			make_clip_tab(saa, vcp, vw.clipcount);
			if (vw.clipcount > 0)
				vfree(vcp);

			/* start capture & clip dma if we have an address */
			if ((saa->cap & 3) && saa->win.vidadr != 0)
				saawrite(((SAA7146_MC1_TR_E_1 |
					SAA7146_MC1_TR_E_2) << 16) | 0xffff,
					SAA7146_MC1);
			return 0;
		}
	case VIDIOCGWIN:
		{
			struct video_window vw;
			vw.x = saa->win.x;
			vw.y = saa->win.y;
			vw.width = saa->win.width;
			vw.height = saa->win.height;
			vw.chromakey = 0;
			vw.flags = 0;
			if (copy_to_user(arg, &vw, sizeof(vw)))
				return -EFAULT;
			return 0;
		}
	case VIDIOCCAPTURE:
		{
			int v;
			if (copy_from_user(&v, arg, sizeof(v)))
				return -EFAULT;
			if (v == 0) {
				saa->cap &= ~1;
				saawrite((SAA7146_MC1_TR_E_1 << 16),
					 SAA7146_MC1);
			} else {
				if (saa->win.vidadr == 0 || saa->win.width == 0
				    || saa->win.height == 0)
					return -EINVAL;
				saa->cap |= 1;
				saawrite((SAA7146_MC1_TR_E_1 << 16) | 0xffff,
					 SAA7146_MC1);
			}
			return 0;
		}
	case VIDIOCGFBUF:
		{
			struct video_buffer v;
			v.base = (void *) saa->win.vidadr;
			v.height = saa->win.sheight;
			v.width = saa->win.swidth;
			v.depth = saa->win.depth;
			v.bytesperline = saa->win.bpl;
			if (copy_to_user(arg, &v, sizeof(v)))
				return -EFAULT;
			return 0;

		}
	case VIDIOCSFBUF:
		{
			struct video_buffer v;
			if (!capable(CAP_SYS_ADMIN))
				return -EPERM;
			if (copy_from_user(&v, arg, sizeof(v)))
				return -EFAULT;
			if (v.depth != 8 && v.depth != 15 && v.depth != 16 &&
			v.depth != 24 && v.depth != 32 && v.width > 16 &&
			    v.height > 16 && v.bytesperline > 16)
				return -EINVAL;
			if (v.base)
				saa->win.vidadr = (unsigned long) v.base;
			saa->win.sheight = v.height;
			saa->win.swidth = v.width;
			saa->win.bpp = ((v.depth + 7) & 0x38) / 8;
			saa->win.depth = v.depth;
			saa->win.bpl = v.bytesperline;

			DEBUG(printk("Display at %p is %d by %d, bytedepth %d, bpl %d\n",
				     v.base, v.width, v.height, saa->win.bpp, saa->win.bpl));
			saa7146_set_winsize(saa);
			return 0;
		}
	case VIDIOCKEY:
		{
			/* Will be handled higher up .. */
			return 0;
		}

	case VIDIOCGAUDIO:
		{
			struct video_audio v;
			v = saa->audio_dev;
			v.flags &= ~(VIDEO_AUDIO_MUTE | VIDEO_AUDIO_MUTABLE);
			v.flags |= VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME;
			strcpy(v.name, "MPEG");
			v.mode = VIDEO_SOUND_STEREO;
			if (copy_to_user(arg, &v, sizeof(v)))
				return -EFAULT;
			return 0;
		}
	case VIDIOCSAUDIO:
		{
			struct video_audio v;
			int i;
			if (copy_from_user(&v, arg, sizeof(v)))
				return -EFAULT;
			i = (~(v.volume>>8))&0xff;
			if (!HaveCS4341) {
				if (v.flags & VIDEO_AUDIO_MUTE) {
					debiwrite(saa, debNormal,
						IBM_MP2_FRNT_ATTEN,
						0xffff, 2);
				}
				if (!(v.flags & VIDEO_AUDIO_MUTE))
					debiwrite(saa, debNormal,
						IBM_MP2_FRNT_ATTEN,
						  0x0000, 2);
				if (v.flags & VIDEO_AUDIO_VOLUME)
					debiwrite(saa, debNormal,
						IBM_MP2_FRNT_ATTEN,
						(i<<8)|i, 2);
			} else {
				if (v.flags & VIDEO_AUDIO_MUTE)
					cs4341_setlevel(saa, 0xff, 0xff);
				if (!(v.flags & VIDEO_AUDIO_MUTE))
					cs4341_setlevel(saa, 0, 0);
				if (v.flags & VIDEO_AUDIO_VOLUME)
					cs4341_setlevel(saa, i, i);
			}
			saa->audio_dev = v;
			return 0;
		}

	case VIDIOCGUNIT:
		{
			struct video_unit vu;
			vu.video = saa->video_dev.minor;
			vu.vbi = VIDEO_NO_UNIT;
			vu.radio = VIDEO_NO_UNIT;
			vu.audio = VIDEO_NO_UNIT;
			vu.teletext = VIDEO_NO_UNIT;
			if (copy_to_user(arg, &vu, sizeof(vu)))
				return -EFAULT;
			return 0;
		}
	case VIDIOCSPLAYMODE:
		{
			struct video_play_mode pmode;
			if (copy_from_user((void *) &pmode, arg,
				sizeof(struct video_play_mode)))
				return -EFAULT;
			switch (pmode.mode) {
				case VID_PLAY_VID_OUT_MODE:
					if (pmode.p1 != VIDEO_MODE_NTSC &&
						pmode.p1 != VIDEO_MODE_PAL)
						return -EINVAL;
					set_out_format(saa, pmode.p1);
					return 0;
				case VID_PLAY_GENLOCK:
					debiwrite(saa, debNormal,
						  XILINX_CTL0,
						  (pmode.p1 ? 0x8000 : 0x8080),
						  2);
					if (NewCard)
						set_genlock_offset(saa,
							pmode.p2);
					return 0;
				case VID_PLAY_NORMAL:
					debiwrite(saa, debNormal,
						IBM_MP2_CHIP_CONTROL,
						ChipControl, 2);
					ibm_send_command(saa,
						IBM_MP2_PLAY, 0, 0);
					saa->playmode = pmode.mode;
					return 0;
				case VID_PLAY_PAUSE:
					/* IBM removed the PAUSE command */
					/* they say use SINGLE_FRAME now */
				case VID_PLAY_SINGLE_FRAME:
					ibm_send_command(saa,
							IBM_MP2_SINGLE_FRAME,
							0, 0);
					if (saa->playmode == pmode.mode) {
						debiwrite(saa, debNormal,
							IBM_MP2_CHIP_CONTROL,
							ChipControl, 2);
					}
					saa->playmode = pmode.mode;
					return 0;
				case VID_PLAY_FAST_FORWARD:
					ibm_send_command(saa,
						IBM_MP2_FAST_FORWARD, 0, 0);
					saa->playmode = pmode.mode;
					return 0;
				case VID_PLAY_SLOW_MOTION:
					ibm_send_command(saa,
						IBM_MP2_SLOW_MOTION,
						pmode.p1, 0);
					saa->playmode = pmode.mode;
					return 0;
				case VID_PLAY_IMMEDIATE_NORMAL:
					/* ensure transfers resume */
					debiwrite(saa, debNormal,
						IBM_MP2_CHIP_CONTROL,
						ChipControl, 2);
					ibm_send_command(saa,
						IBM_MP2_IMED_NORM_PLAY, 0, 0);
					saa->playmode = VID_PLAY_NORMAL;
					return 0;
				case VID_PLAY_SWITCH_CHANNELS:
					saa->audhead = saa->audtail = 0;
					saa->vidhead = saa->vidtail = 0;
					ibm_send_command(saa,
						IBM_MP2_FREEZE_FRAME, 0, 1);
					ibm_send_command(saa,
						IBM_MP2_RESET_AUD_RATE, 0, 1);
					debiwrite(saa, debNormal,
						IBM_MP2_CHIP_CONTROL, 0, 2);
					ibm_send_command(saa,
						IBM_MP2_CHANNEL_SWITCH, 0, 1);
					debiwrite(saa, debNormal,
						IBM_MP2_CHIP_CONTROL,
						ChipControl, 2);
					ibm_send_command(saa,
						IBM_MP2_PLAY, 0, 0);
					saa->playmode = VID_PLAY_NORMAL;
					return 0;
				case VID_PLAY_FREEZE_FRAME:
					ibm_send_command(saa,
						IBM_MP2_FREEZE_FRAME, 0, 0);
					saa->playmode = pmode.mode;
					return 0;
				case VID_PLAY_STILL_MODE:
					ibm_send_command(saa,
						IBM_MP2_SET_STILL_MODE, 0, 0);
					saa->playmode = pmode.mode;
					return 0;
				case VID_PLAY_MASTER_MODE:
					if (pmode.p1 == VID_PLAY_MASTER_NONE)
						saa->boardcfg[1] = 0x13;
					else if (pmode.p1 ==
						VID_PLAY_MASTER_VIDEO)
						saa->boardcfg[1] = 0x23;
					else if (pmode.p1 ==
						VID_PLAY_MASTER_AUDIO)
						saa->boardcfg[1] = 0x43;
					else
						return -EINVAL;
					debiwrite(saa, debNormal,
						IBM_MP2_CHIP_CONTROL,
						ChipControl, 2);
					return 0;
				case VID_PLAY_ACTIVE_SCANLINES:
					if (CurrentMode == VIDEO_MODE_PAL) {
						if (pmode.p1 < 1 ||
							pmode.p2 > 625)
							return -EINVAL;
						saa->boardcfg[5] = pmode.p1;
						saa->boardcfg[55] = (pmode.p1 +
							(pmode.p2/2) - 1) &	
							0xff;
					} else {
						if (pmode.p1 < 4 ||
							pmode.p2 > 525)
							return -EINVAL;
						saa->boardcfg[4] = pmode.p1;
						saa->boardcfg[54] = (pmode.p1 +
							(pmode.p2/2) - 4) &
							0xff;
					}
					set_out_format(saa, CurrentMode);
				case VID_PLAY_RESET:
					return do_ibm_reset(saa);
				case VID_PLAY_END_MARK:
					if (saa->endmarktail <  
						saa->endmarkhead) {
						if (saa->endmarkhead -
							saa->endmarktail < 2)
							return -ENOSPC;
					} else if (saa->endmarkhead <=
						saa->endmarktail) {
						if (saa->endmarktail -
							saa->endmarkhead >
							(MAX_MARKS - 2))
							return -ENOSPC;
					} else
						return -ENOSPC;
					saa->endmark[saa->endmarktail] =
						saa->audtail;
					saa->endmarktail++;
					if (saa->endmarktail >= MAX_MARKS)
						saa->endmarktail = 0;
			}
			return -EINVAL;
		}
	case VIDIOCSWRITEMODE:
		{
			int mode;
			if (copy_from_user((void *) &mode, arg, sizeof(int)))
				 return -EFAULT;
			if (mode == VID_WRITE_MPEG_AUD ||
			    mode == VID_WRITE_MPEG_VID ||
			    mode == VID_WRITE_CC ||
			    mode == VID_WRITE_TTX ||
			    mode == VID_WRITE_OSD) {
				saa->writemode = mode;
				return 0;
			}
			return -EINVAL;
		}
	case VIDIOCSMICROCODE:
		{
			struct video_code ucode;
			__u8 *udata;
			int i;
			if (copy_from_user(&ucode, arg, sizeof(ucode)))
				return -EFAULT;
			if (ucode.datasize > 65536 || ucode.datasize < 1024 ||
			    strncmp(ucode.loadwhat, "dec", 3))
				return -EINVAL;
			if ((udata = vmalloc(ucode.datasize)) == NULL)
				return -ENOMEM;
			if (copy_from_user(udata, ucode.data, ucode.datasize)) {
				vfree(udata);
				return -EFAULT;
			}
			ucode.data = udata;
			if (!strncmp(ucode.loadwhat, "decoder.aud", 11)
				|| !strncmp(ucode.loadwhat, "decoder.vid", 11))
				i = initialize_ibmmpeg2(&ucode);
			else
				i = initialize_fpga(&ucode);
			vfree(udata);
			if (i)
				return -EINVAL;
			return 0;

		}
	case VIDIOCGCHAN:	/* this makes xawtv happy */
		{
			struct video_channel v;
			if (copy_from_user(&v, arg, sizeof(v)))
				return -EFAULT;
			v.flags = VIDEO_VC_AUDIO;
			v.tuners = 0;
			v.type = VID_TYPE_MPEG_DECODER;
			v.norm = CurrentMode;
			strcpy(v.name, "MPEG2");
			if (copy_to_user(arg, &v, sizeof(v)))
				return -EFAULT;
			return 0;
		}
	case VIDIOCSCHAN:	/* this makes xawtv happy */
		{
			struct video_channel v;
			if (copy_from_user(&v, arg, sizeof(v)))
				return -EFAULT;
			/* do nothing */
			return 0;
		}
	default:
		return -ENOIOCTLCMD;
	}
	return 0;
}

static int saa_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct saa7146 *saa = file->private_data;
	printk(KERN_DEBUG "stradis%d: saa_mmap called\n", saa->nr);
	return -EINVAL;
}

static ssize_t saa_read(struct file *file, char __user *buf,
			size_t count, loff_t *ppos)
{
	return -EINVAL;
}

static ssize_t saa_write(struct file *file, const char __user *buf,
			 size_t count, loff_t *ppos)
{
	struct saa7146 *saa = file->private_data;
	unsigned long todo = count;
	int blocksize, split;
	unsigned long flags;

	while (todo > 0) {
		if (saa->writemode == VID_WRITE_MPEG_AUD) {
			spin_lock_irqsave(&saa->lock, flags);
			if (saa->audhead <= saa->audtail)
				blocksize = 65536-(saa->audtail - saa->audhead);
			else
				blocksize = saa->audhead - saa->audtail;
			spin_unlock_irqrestore(&saa->lock, flags);
			if (blocksize < 16384) {
				saawrite(SAA7146_PSR_DEBI_S |
					 SAA7146_PSR_PIN1, SAA7146_IER);
				saawrite(SAA7146_PSR_PIN1, SAA7146_PSR);
				/* wait for buffer space to open */
				interruptible_sleep_on(&saa->audq);
			}
			spin_lock_irqsave(&saa->lock, flags);
			if (saa->audhead <= saa->audtail) {
				blocksize = 65536-(saa->audtail - saa->audhead);
				split = 65536 - saa->audtail;
			} else {
				blocksize = saa->audhead - saa->audtail;
				split = 65536;
			}
			spin_unlock_irqrestore(&saa->lock, flags);
			blocksize--;
			if (blocksize > todo)
				blocksize = todo;
			/* double check that we really have space */
			if (!blocksize)
				return -ENOSPC;
			if (split < blocksize) {
				if (copy_from_user(saa->audbuf +
					saa->audtail, buf, split)) 
					return -EFAULT;
				buf += split;
				todo -= split;
				blocksize -= split;
				saa->audtail = 0;
			}
			if (copy_from_user(saa->audbuf + saa->audtail, buf,
				blocksize)) 
				return -EFAULT;
			saa->audtail += blocksize;
			todo -= blocksize;
			buf += blocksize;
			saa->audtail &= 0xffff;
		} else if (saa->writemode == VID_WRITE_MPEG_VID) {
			spin_lock_irqsave(&saa->lock, flags);
			if (saa->vidhead <= saa->vidtail)
				blocksize=524288-(saa->vidtail - saa->vidhead);
			else
				blocksize = saa->vidhead - saa->vidtail;
			spin_unlock_irqrestore(&saa->lock, flags);
			if (blocksize < 65536) {
				saawrite(SAA7146_PSR_DEBI_S |
					 SAA7146_PSR_PIN1, SAA7146_IER);
				saawrite(SAA7146_PSR_PIN1, SAA7146_PSR);
				/* wait for buffer space to open */
				interruptible_sleep_on(&saa->vidq);
			}
			spin_lock_irqsave(&saa->lock, flags);
			if (saa->vidhead <= saa->vidtail) {
				blocksize=524288-(saa->vidtail - saa->vidhead);
				split = 524288 - saa->vidtail;
			} else {
				blocksize = saa->vidhead - saa->vidtail;
				split = 524288;
			}
			spin_unlock_irqrestore(&saa->lock, flags);
			blocksize--;
			if (blocksize > todo)
				blocksize = todo;
			/* double check that we really have space */
			if (!blocksize)
				return -ENOSPC;
			if (split < blocksize) {
				if (copy_from_user(saa->vidbuf +
					saa->vidtail, buf, split)) 
					return -EFAULT;
				buf += split;
				todo -= split;
				blocksize -= split;
				saa->vidtail = 0;
			}
			if (copy_from_user(saa->vidbuf + saa->vidtail, buf,
				blocksize)) 
				return -EFAULT;
			saa->vidtail += blocksize;
			todo -= blocksize;
			buf += blocksize;
			saa->vidtail &= 0x7ffff;
		} else if (saa->writemode == VID_WRITE_OSD) {
			if (count > 131072)
				return -ENOSPC;
			if (copy_from_user(saa->osdbuf, buf, count))
				return -EFAULT;
			buf += count;
			saa->osdhead = 0;
			saa->osdtail = count;
			debiwrite(saa, debNormal, IBM_MP2_OSD_ADDR, 0, 2);
			debiwrite(saa, debNormal, IBM_MP2_OSD_LINK_ADDR, 0, 2);
			debiwrite(saa, debNormal, IBM_MP2_MASK0, 0xc00d, 2);
			debiwrite(saa, debNormal, IBM_MP2_DISP_MODE,
				  debiread(saa, debNormal,
				  IBM_MP2_DISP_MODE, 2) | 1, 2);
			/* trigger osd data transfer */
			saawrite(SAA7146_PSR_DEBI_S |
				 SAA7146_PSR_PIN1, SAA7146_IER);
			saawrite(SAA7146_PSR_PIN1, SAA7146_PSR);
		}
	}
	return count;
}

static int saa_open(struct inode *inode, struct file *file)
{
	struct saa7146 *saa = NULL;
	unsigned int minor = iminor(inode);
	int i;

	for (i = 0; i < SAA7146_MAX; i++) {
		if (saa7146s[i].video_dev.minor == minor) {
			saa = &saa7146s[i];
		}
	}
	if (saa == NULL) {
		return -ENODEV;
	}
	file->private_data = saa;

	//saa->video_dev.busy = 0; /* old hack to support multiple open */
	saa->user++;
	if (saa->user > 1)
		return 0;	/* device open already, don't reset */
	saa->writemode = VID_WRITE_MPEG_VID;	/* default to video */
	return 0;
}

static int saa_release(struct inode *inode, struct file *file)
{
	struct saa7146 *saa = file->private_data;
	saa->user--;
	//saa->video_dev.busy = 0; /* old hack to support multiple open */
	if (saa->user > 0)	/* still someone using device */
		return 0;
	saawrite(0x007f0000, SAA7146_MC1);	/* stop all overlay dma */
	return 0;
}

static struct file_operations saa_fops =
{
	.owner		= THIS_MODULE,
	.open		= saa_open,
	.release	= saa_release,
	.ioctl		= saa_ioctl,
	.read		= saa_read,
	.llseek		= no_llseek,
	.write		= saa_write,
	.mmap		= saa_mmap,
};

/* template for video_device-structure */
static struct video_device saa_template =
{
	.name		= "SAA7146A",
	.type		= VID_TYPE_CAPTURE | VID_TYPE_OVERLAY,
	.hardware	= VID_HARDWARE_SAA7146,
	.fops		= &saa_fops,
	.minor		= -1,
};

static int configure_saa7146(struct pci_dev *dev, int num)
{
	int result;
	struct saa7146 *saa;

	saa = &saa7146s[num];
	
	saa->endmarkhead = saa->endmarktail = 0;
	saa->win.x = saa->win.y = 0;
	saa->win.width = saa->win.cropwidth = 720;
	saa->win.height = saa->win.cropheight = 480;
	saa->win.cropx = saa->win.cropy = 0;
	saa->win.bpp = 2;
	saa->win.depth = 16;
	saa->win.color_fmt = palette2fmt[VIDEO_PALETTE_RGB565];
	saa->win.bpl = 1024 * saa->win.bpp;
	saa->win.swidth = 1024;
	saa->win.sheight = 768;
	saa->picture.brightness = 32768;
	saa->picture.contrast = 38768;
	saa->picture.colour = 32768;
	saa->cap = 0;
	saa->dev = dev;
	saa->nr = num;
	saa->playmode = VID_PLAY_NORMAL;
	memset(saa->boardcfg, 0, 64);	/* clear board config area */
	saa->saa7146_mem = NULL;
	saa->dmavid1 = saa->dmavid2 = saa->dmavid3 = saa->dmaa1in =
	    saa->dmaa1out = saa->dmaa2in = saa->dmaa2out =
	    saa->pagevid1 = saa->pagevid2 = saa->pagevid3 = saa->pagea1in =
	    saa->pagea1out = saa->pagea2in = saa->pagea2out =
	    saa->pagedebi = saa->dmaRPS1 = saa->dmaRPS2 = saa->pageRPS1 =
	    saa->pageRPS2 = NULL;
	saa->audbuf = saa->vidbuf = saa->osdbuf = saa->dmadebi = NULL;
	saa->audhead = saa->vidtail = 0;

	init_waitqueue_head(&saa->i2cq);
	init_waitqueue_head(&saa->audq);
	init_waitqueue_head(&saa->debiq);
	init_waitqueue_head(&saa->vidq);
	spin_lock_init(&saa->lock);

	if (pci_enable_device(dev))
		return -EIO;
	
	saa->id = dev->device;
	saa->irq = dev->irq;
	saa->video_dev.minor = -1;
	saa->saa7146_adr = pci_resource_start(dev, 0);
	pci_read_config_byte(dev, PCI_CLASS_REVISION, &saa->revision);

	saa->saa7146_mem = ioremap(saa->saa7146_adr, 0x200);
	if (!saa->saa7146_mem)
		return -EIO;

	memcpy(&saa->video_dev, &saa_template, sizeof(saa_template));
	saawrite(0, SAA7146_IER);	/* turn off all interrupts */
	result = request_irq(saa->irq, saa7146_irq,
		       SA_SHIRQ | SA_INTERRUPT, "stradis", (void *) saa);
	if (result == -EINVAL)
		printk(KERN_ERR "stradis%d: Bad irq number or handler\n",
		       num);
	if (result == -EBUSY)
		printk(KERN_ERR "stradis%d: IRQ %ld busy, change your PnP"
		       " config in BIOS\n", num, saa->irq);
	if (result < 0) {
		iounmap(saa->saa7146_mem);
		return result;
	}
	pci_set_master(dev);
	if (video_register_device(&saa->video_dev, VFL_TYPE_GRABBER, video_nr) < 0) {
		iounmap(saa->saa7146_mem);
		return -1;
	}
	return 0;
}

static int init_saa7146(int i)
{
	struct saa7146 *saa = &saa7146s[i];

	saa->user = 0;
	/* reset the saa7146 */
	saawrite(0xffff0000, SAA7146_MC1);
	mdelay(5);
	/* enable debi and i2c transfers and pins */
	saawrite(((SAA7146_MC1_EDP | SAA7146_MC1_EI2C |
		   SAA7146_MC1_TR_E_DEBI) << 16) | 0xffff, SAA7146_MC1);
	/* ensure proper state of chip */
	saawrite(0x00000000, SAA7146_PAGE1);
	saawrite(0x00f302c0, SAA7146_NUM_LINE_BYTE1);
	saawrite(0x00000000, SAA7146_PAGE2);
	saawrite(0x01400080, SAA7146_NUM_LINE_BYTE2);
	saawrite(0x00000000, SAA7146_DD1_INIT);
	saawrite(0x00000000, SAA7146_DD1_STREAM_B);
	saawrite(0x00000000, SAA7146_DD1_STREAM_A);
	saawrite(0x00000000, SAA7146_BRS_CTRL);
	saawrite(0x80400040, SAA7146_BCS_CTRL);
	saawrite(0x0000e000 /*| (1<<29)*/, SAA7146_HPS_CTRL);
	saawrite(0x00000060, SAA7146_CLIP_FORMAT_CTRL);
	saawrite(0x00000000, SAA7146_ACON1);
	saawrite(0x00000000, SAA7146_ACON2);
	saawrite(0x00000600, SAA7146_I2C_STATUS);
	saawrite(((SAA7146_MC2_UPLD_D1_B | SAA7146_MC2_UPLD_D1_A |
		   SAA7146_MC2_UPLD_BRS | SAA7146_MC2_UPLD_HPS_H |
		   SAA7146_MC2_UPLD_HPS_V | SAA7146_MC2_UPLD_DMA2 |
	   SAA7146_MC2_UPLD_DMA1 | SAA7146_MC2_UPLD_I2C) << 16) | 0xffff,
		 SAA7146_MC2);
	/* setup arbitration control registers */
	saawrite(0x1412121a, SAA7146_PCI_BT_V1);

	/* allocate 32k dma buffer + 4k for page table */
	if ((saa->dmadebi = kmalloc(32768 + 4096, GFP_KERNEL)) == NULL) {
		printk(KERN_ERR "stradis%d: debi kmalloc failed\n", i);
		return -1;
	}
#if 0
	saa->pagedebi = saa->dmadebi + 32768;	/* top 4k is for mmu */
	saawrite(virt_to_bus(saa->pagedebi) /*|0x800 */ , SAA7146_DEBI_PAGE);
	for (i = 0; i < 12; i++)	/* setup mmu page table */
		saa->pagedebi[i] = virt_to_bus((saa->dmadebi + i * 4096));
#endif
	saa->audhead = saa->vidhead = saa->osdhead = 0;
	saa->audtail = saa->vidtail = saa->osdtail = 0;
	if (saa->vidbuf == NULL)
		if ((saa->vidbuf = vmalloc(524288)) == NULL) {
			printk(KERN_ERR "stradis%d: malloc failed\n", saa->nr);
			return -ENOMEM;
		}
	if (saa->audbuf == NULL)
		if ((saa->audbuf = vmalloc(65536)) == NULL) {
			printk(KERN_ERR "stradis%d: malloc failed\n", saa->nr);
			vfree(saa->vidbuf);
			saa->vidbuf = NULL;
			return -ENOMEM;
		}
	if (saa->osdbuf == NULL)
		if ((saa->osdbuf = vmalloc(131072)) == NULL) {
			printk(KERN_ERR "stradis%d: malloc failed\n", saa->nr);
			vfree(saa->vidbuf);
			vfree(saa->audbuf);
			saa->vidbuf = saa->audbuf = NULL;
			return -ENOMEM;
		}
	/* allocate 81920 byte buffer for clipping */
	if ((saa->dmavid2 = kmalloc(VIDEO_CLIPMAP_SIZE, GFP_KERNEL)) == NULL) {
		printk(KERN_ERR "stradis%d: clip kmalloc failed\n", saa->nr);
		vfree(saa->vidbuf);
		vfree(saa->audbuf);
		vfree(saa->osdbuf);
		saa->vidbuf = saa->audbuf = saa->osdbuf = NULL;
		saa->dmavid2 = NULL;
		return -1;
	}
	memset(saa->dmavid2, 0x00, VIDEO_CLIPMAP_SIZE);	/* clip everything */
	/* setup clipping registers */
	saawrite(virt_to_bus(saa->dmavid2), SAA7146_BASE_EVEN2);
	saawrite(virt_to_bus(saa->dmavid2) + 128, SAA7146_BASE_ODD2);
	saawrite(virt_to_bus(saa->dmavid2) + VIDEO_CLIPMAP_SIZE,
		SAA7146_PROT_ADDR2);
	saawrite(256, SAA7146_PITCH2);
	saawrite(4, SAA7146_PAGE2); /* dma direction: read, no byteswap */
	saawrite(((SAA7146_MC2_UPLD_DMA2) << 16) | SAA7146_MC2_UPLD_DMA2,
		 SAA7146_MC2);
	I2CBusScan(saa);
	return 0;
}

static void release_saa(void)
{
	u8 command;
	int i;
	struct saa7146 *saa;

	for (i = 0; i < saa_num; i++) {
		saa = &saa7146s[i];

		/* turn off all capturing, DMA and IRQs */
		saawrite(0xffff0000, SAA7146_MC1);	/* reset chip */
		saawrite(0, SAA7146_MC2);
		saawrite(0, SAA7146_IER);
		saawrite(0xffffffffUL, SAA7146_ISR);

		/* disable PCI bus-mastering */
		pci_read_config_byte(saa->dev, PCI_COMMAND, &command);
		command &= ~PCI_COMMAND_MASTER;
		pci_write_config_byte(saa->dev, PCI_COMMAND, command);

		/* unmap and free memory */
		saa->audhead = saa->audtail = saa->osdhead = 0;
		saa->vidhead = saa->vidtail = saa->osdtail = 0;
		if (saa->vidbuf)
			vfree(saa->vidbuf);
		if (saa->audbuf)
			vfree(saa->audbuf);
		if (saa->osdbuf)
			vfree(saa->osdbuf);
		if (saa->dmavid2)
			kfree((void *) saa->dmavid2);
		saa->audbuf = saa->vidbuf = saa->osdbuf = NULL;
		saa->dmavid2 = NULL;
		if (saa->dmadebi)
			kfree((void *) saa->dmadebi);
		if (saa->dmavid1)
			kfree((void *) saa->dmavid1);
		if (saa->dmavid2)
			kfree((void *) saa->dmavid2);
		if (saa->dmavid3)
			kfree((void *) saa->dmavid3);
		if (saa->dmaa1in)
			kfree((void *) saa->dmaa1in);
		if (saa->dmaa1out)
			kfree((void *) saa->dmaa1out);
		if (saa->dmaa2in)
			kfree((void *) saa->dmaa2in);
		if (saa->dmaa2out)
			kfree((void *) saa->dmaa2out);
		if (saa->dmaRPS1)
			kfree((void *) saa->dmaRPS1);
		if (saa->dmaRPS2)
			kfree((void *) saa->dmaRPS2);
		free_irq(saa->irq, saa);
		if (saa->saa7146_mem)
			iounmap(saa->saa7146_mem);
		if (saa->video_dev.minor != -1)
			video_unregister_device(&saa->video_dev);
	}
}


static int __init stradis_init (void)
{
	struct pci_dev *dev = NULL;
	int result = 0, i;

	saa_num = 0;

	while ((dev = pci_find_device(PCI_VENDOR_ID_PHILIPS, PCI_DEVICE_ID_PHILIPS_SAA7146, dev))) {
		if (!dev->subsystem_vendor)
			printk(KERN_INFO "stradis%d: rev1 decoder\n", saa_num);
		else
			printk(KERN_INFO "stradis%d: SDM2xx found\n", saa_num); 
		result = configure_saa7146(dev, saa_num++);
		if (result)
			return result;
	}
	if (saa_num)
		printk(KERN_INFO "stradis: %d card(s) found.\n", saa_num);
	else
		return -EINVAL;
	for (i = 0; i < saa_num; i++)
		if (init_saa7146(i) < 0) {
			release_saa();
			return -EIO;
		}
	return 0;
}


static void __exit stradis_exit (void)
{
	release_saa();
	printk(KERN_INFO "stradis: module cleanup complete\n");
}


module_init(stradis_init);
module_exit(stradis_exit);