Import 2.3.18pre1

[davej-history.git] / drivers / scsi / in2000.c

/*
 * in2000.c - Linux device driver for the
 * Always IN2000 ISA SCSI card.
 *
 * Copyright (c) 1996 John Shifflett, GeoLog Consulting
 * john@geolog.com
 * jshiffle@netcom.com
 *
 * 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, 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.
 *
 *
 * Drew Eckhardt's excellent 'Generic NCR5380' sources provided
 * much of the inspiration and some of the code for this driver.
 * The Linux IN2000 driver distributed in the Linux kernels through
 * version 1.2.13 was an extremely valuable reference on the arcane
 * (and still mysterious) workings of the IN2000's fifo. It also
 * is where I lifted in2000_biosparam(), the gist of the card
 * detection scheme, and other bits of code. Many thanks to the
 * talented and courageous people who wrote, contributed to, and
 * maintained that driver (including Brad McLean, Shaun Savage,
 * Bill Earnest, Larry Doolittle, Roger Sunshine, John Luckey,
 * Matt Postiff, Peter Lu, zerucha@shell.portal.com, and Eric
 * Youngdale). I should also mention the driver written by
 * Hamish Macdonald for the (GASP!) Amiga A2091 card, included
 * in the Linux-m68k distribution; it gave me a good initial
 * understanding of the proper way to run a WD33c93 chip, and I
 * ended up stealing lots of code from it.
 *
 * _This_ driver is (I feel) an improvement over the old one in
 * several respects:
 * - All problems relating to the data size of a SCSI request are
 * gone (as far as I know). The old driver couldn't handle
 * swapping to partitions because that involved 4k blocks, nor
 * could it deal with the st.c tape driver unmodified, because
 * that usually involved 4k - 32k blocks. The old driver never
 * quite got away from a morbid dependence on 2k block sizes -
 * which of course is the size of the card's fifo.
 *
 * - Target Disconnection/Reconnection is now supported. Any
 * system with more than one device active on the SCSI bus
 * will benefit from this. The driver defaults to what I'm
 * calling 'adaptive disconnect' - meaning that each command
 * is evaluated individually as to whether or not it should
 * be run with the option to disconnect/reselect (if the
 * device chooses), or as a "SCSI-bus-hog".
 *
 * - Synchronous data transfers are now supported. Because there
 * are a few devices (and many improperly terminated systems)
 * that choke when doing sync, the default is sync DISABLED
 * for all devices. This faster protocol can (and should!)
 * be enabled on selected devices via the command-line.
 *
 * - Runtime operating parameters can now be specified through
 * either the LILO or the 'insmod' command line. For LILO do:
 * "in2000=blah,blah,blah"
 * and with insmod go like:
 * "insmod /usr/src/linux/modules/in2000.o setup_strings=blah,blah"
 * The defaults should be good for most people. See the comment
 * for 'setup_strings' below for more details.
 *
 * - The old driver relied exclusively on what the Western Digital
 * docs call "Combination Level 2 Commands", which are a great
 * idea in that the CPU is relieved of a lot of interrupt
 * overhead. However, by accepting a certain (user-settable)
 * amount of additional interrupts, this driver achieves
 * better control over the SCSI bus, and data transfers are
 * almost as fast while being much easier to define, track,
 * and debug.
 *
 * - You can force detection of a card whose BIOS has been disabled.
 *
 * - Multiple IN2000 cards might almost be supported. I've tried to
 * keep it in mind, but have no way to test...
 *
 *
 * TODO:
 * tagged queuing. multiple cards.
 *
 *
 * NOTE:
 * When using this or any other SCSI driver as a module, you'll
 * find that with the stock kernel, at most _two_ SCSI hard
 * drives will be linked into the device list (ie, usable).
 * If your IN2000 card has more than 2 disks on its bus, you
 * might want to change the define of 'SD_EXTRA_DEVS' in the
 * 'hosts.h' file from 2 to whatever is appropriate. It took
 * me a while to track down this surprisingly obscure and
 * undocumented little "feature".
 *
 *
 * People with bug reports, wish-lists, complaints, comments,
 * or improvements are asked to pah-leeez email me (John Shifflett)
 * at john@geolog.com or jshiffle@netcom.com! I'm anxious to get
 * this thing into as good a shape as possible, and I'm positive
 * there are lots of lurking bugs and "Stupid Places".
 *
 */

#include <linux/module.h>

#include <asm/system.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <asm/io.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>

#include <linux/blk.h>
#include <linux/stat.h>

#include"scsi.h"
#include"sd.h"
#include"hosts.h"

#define IN2000_VERSION"1.33"
#define IN2000_DATE"26/August/1998"

#include"in2000.h"


/*
 * 'setup_strings' is a single string used to pass operating parameters and
 * settings from the kernel/module command-line to the driver. 'setup_args[]'
 * is an array of strings that define the compile-time default values for
 * these settings. If Linux boots with a LILO or insmod command-line, those
 * settings are combined with 'setup_args[]'. Note that LILO command-lines
 * are prefixed with "in2000=" while insmod uses a "setup_strings=" prefix.
 * The driver recognizes the following keywords (lower case required) and
 * arguments:
 *
 * - ioport:addr -Where addr is IO address of a (usually ROM-less) card.
 * - noreset -No optional args. Prevents SCSI bus reset at boot time.
 * - nosync:x -x is a bitmask where the 1st 7 bits correspond with
 * the 7 possible SCSI devices (bit 0 for device #0, etc).
 * Set a bit to PREVENT sync negotiation on that device.
 * The driver default is sync DISABLED on all devices.
 * - period:ns -ns is the minimum # of nanoseconds in a SCSI data transfer
 * period. Default is 500; acceptable values are 250 - 1000.
 * - disconnect:x -x = 0 to never allow disconnects, 2 to always allow them.
 * x = 1 does 'adaptive' disconnects, which is the default
 * and generally the best choice.
 * - debug:x -If 'DEBUGGING_ON' is defined, x is a bitmask that causes
 * various types of debug output to printed - see the DB_xxx
 * defines in in2000.h
 * - proc:x -If 'PROC_INTERFACE' is defined, x is a bitmask that
 * determines how the /proc interface works and what it
 * does - see the PR_xxx defines in in2000.h
 *
 * Syntax Notes:
 * - Numeric arguments can be decimal or the '0x' form of hex notation. There
 * _must_ be a colon between a keyword and its numeric argument, with no
 * spaces.
 * - Keywords are separated by commas, no spaces, in the standard kernel
 * command-line manner.
 * - A keyword in the 'nth' comma-separated command-line member will overwrite
 * the 'nth' element of setup_args[]. A blank command-line member (in
 * other words, a comma with no preceding keyword) will _not_ overwrite
 * the corresponding setup_args[] element.
 *
 * A few LILO examples (for insmod, use 'setup_strings' instead of 'in2000'):
 * - in2000=ioport:0x220,noreset
 * - in2000=period:250,disconnect:2,nosync:0x03
 * - in2000=debug:0x1e
 * - in2000=proc:3
 */

/* Normally, no defaults are specified... */
static char*setup_args[] =
{"","","","","","","","",""};

/* filled in by 'insmod' */
static char*setup_strings =0;

#ifdef MODULE_PARM
MODULE_PARM(setup_strings,"s");
#endif


static struct Scsi_Host *instance_list =0;



staticinline uchar read_3393(struct IN2000_hostdata *hostdata, uchar reg_num)
{
write1_io(reg_num,IO_WD_ADDR);
returnread1_io(IO_WD_DATA);
}


#define READ_AUX_STAT() read1_io(IO_WD_ASR)


staticinlinevoidwrite_3393(struct IN2000_hostdata *hostdata, uchar reg_num, uchar value)
{
write1_io(reg_num,IO_WD_ADDR);
write1_io(value,IO_WD_DATA);
}


staticinlinevoidwrite_3393_cmd(struct IN2000_hostdata *hostdata, uchar cmd)
{
/* while (READ_AUX_STAT() & ASR_CIP)
 printk("|");*/
write1_io(WD_COMMAND,IO_WD_ADDR);
write1_io(cmd,IO_WD_DATA);
}


static uchar read_1_byte(struct IN2000_hostdata *hostdata)
{
uchar asr, x =0;

write_3393(hostdata,WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
write_3393_cmd(hostdata,WD_CMD_TRANS_INFO|0x80);
do{
 asr =READ_AUX_STAT();
if(asr & ASR_DBR)
 x =read_3393(hostdata,WD_DATA);
}while(!(asr & ASR_INT));
return x;
}


static voidwrite_3393_count(struct IN2000_hostdata *hostdata,unsigned long value)
{
write1_io(WD_TRANSFER_COUNT_MSB,IO_WD_ADDR);
write1_io((value >>16),IO_WD_DATA);
write1_io((value >>8),IO_WD_DATA);
write1_io(value,IO_WD_DATA);
}


static unsigned longread_3393_count(struct IN2000_hostdata *hostdata)
{
unsigned long value;

write1_io(WD_TRANSFER_COUNT_MSB,IO_WD_ADDR);
 value =read1_io(IO_WD_DATA) <<16;
 value |=read1_io(IO_WD_DATA) <<8;
 value |=read1_io(IO_WD_DATA);
return value;
}


/* The 33c93 needs to be told which direction a command transfers its
 * data; we use this function to figure it out. Returns true if there
 * will be a DATA_OUT phase with this command, false otherwise.
 * (Thanks to Joerg Dorchain for the research and suggestion.)
 */
static intis_dir_out(Scsi_Cmnd *cmd)
{
switch(cmd->cmnd[0]) {
case WRITE_6:case WRITE_10:case WRITE_12:
case WRITE_LONG:case WRITE_SAME:case WRITE_BUFFER:
case WRITE_VERIFY:case WRITE_VERIFY_12:
case COMPARE:case COPY:case COPY_VERIFY:
case SEARCH_EQUAL:case SEARCH_HIGH:case SEARCH_LOW:
case SEARCH_EQUAL_12:case SEARCH_HIGH_12:case SEARCH_LOW_12:
case FORMAT_UNIT:case REASSIGN_BLOCKS:case RESERVE:
case MODE_SELECT:case MODE_SELECT_10:case LOG_SELECT:
case SEND_DIAGNOSTIC:case CHANGE_DEFINITION:case UPDATE_BLOCK:
case SET_WINDOW:case MEDIUM_SCAN:case SEND_VOLUME_TAG:
case0xea:
return1;
default:
return0;
}
}



static struct sx_period sx_table[] = {
{1,0x20},
{252,0x20},
{376,0x30},
{500,0x40},
{624,0x50},
{752,0x60},
{876,0x70},
{1000,0x00},
{0,0} };

static intround_period(unsigned int period)
{
int x;

for(x=1; sx_table[x].period_ns; x++) {
if((period <= sx_table[x-0].period_ns) &&
(period > sx_table[x-1].period_ns)) {
return x;
}
}
return7;
}

static uchar calc_sync_xfer(unsigned int period,unsigned int offset)
{
uchar result;

 period *=4;/* convert SDTR code to ns */
 result = sx_table[round_period(period)].reg_value;
 result |= (offset < OPTIMUM_SX_OFF)?offset:OPTIMUM_SX_OFF;
return result;
}



static voidin2000_execute(struct Scsi_Host *instance);

intin2000_queuecommand(Scsi_Cmnd *cmd,void(*done)(Scsi_Cmnd *))
{
struct IN2000_hostdata *hostdata;
Scsi_Cmnd *tmp;
unsigned long flags;

 hostdata = (struct IN2000_hostdata *)cmd->host->hostdata;

DB(DB_QUEUE_COMMAND,printk("Q-%d-%02x-%ld(",cmd->target,cmd->cmnd[0],cmd->pid))

/* Set up a few fields in the Scsi_Cmnd structure for our own use:
 * - host_scribble is the pointer to the next cmd in the input queue
 * - scsi_done points to the routine we call when a cmd is finished
 * - result is what you'd expect
 */

 cmd->host_scribble = NULL;
 cmd->scsi_done = done;
 cmd->result =0;

/* We use the Scsi_Pointer structure that's included with each command
 * as a scratchpad (as it's intended to be used!). The handy thing about
 * the SCp.xxx fields is that they're always associated with a given
 * cmd, and are preserved across disconnect-reselect. This means we
 * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages
 * if we keep all the critical pointers and counters in SCp:
 * - SCp.ptr is the pointer into the RAM buffer
 * - SCp.this_residual is the size of that buffer
 * - SCp.buffer points to the current scatter-gather buffer
 * - SCp.buffers_residual tells us how many S.G. buffers there are
 * - SCp.have_data_in helps keep track of >2048 byte transfers
 * - SCp.sent_command is not used
 * - SCp.phase records this command's SRCID_ER bit setting
 */

if(cmd->use_sg) {
 cmd->SCp.buffer = (struct scatterlist *)cmd->buffer;
 cmd->SCp.buffers_residual = cmd->use_sg -1;
 cmd->SCp.ptr = (char*)cmd->SCp.buffer->address;
 cmd->SCp.this_residual = cmd->SCp.buffer->length;
}
else{
 cmd->SCp.buffer = NULL;
 cmd->SCp.buffers_residual =0;
 cmd->SCp.ptr = (char*)cmd->request_buffer;
 cmd->SCp.this_residual = cmd->request_bufflen;
}
 cmd->SCp.have_data_in =0;

/* We don't set SCp.phase here - that's done in in2000_execute() */

/* WD docs state that at the conclusion of a "LEVEL2" command, the
 * status byte can be retrieved from the LUN register. Apparently,
 * this is the case only for *uninterrupted* LEVEL2 commands! If
 * there are any unexpected phases entered, even if they are 100%
 * legal (different devices may choose to do things differently),
 * the LEVEL2 command sequence is exited. This often occurs prior
 * to receiving the status byte, in which case the driver does a
 * status phase interrupt and gets the status byte on its own.
 * While such a command can then be "resumed" (ie restarted to
 * finish up as a LEVEL2 command), the LUN register will NOT be
 * a valid status byte at the command's conclusion, and we must
 * use the byte obtained during the earlier interrupt. Here, we
 * preset SCp.Status to an illegal value (0xff) so that when
 * this command finally completes, we can tell where the actual
 * status byte is stored.
 */

 cmd->SCp.Status = ILLEGAL_STATUS_BYTE;

/* We need to disable interrupts before messing with the input
 * queue and calling in2000_execute().
 */

save_flags(flags);
cli();

/*
 * Add the cmd to the end of 'input_Q'. Note that REQUEST_SENSE
 * commands are added to the head of the queue so that the desired
 * sense data is not lost before REQUEST_SENSE executes.
 */

if(!(hostdata->input_Q) || (cmd->cmnd[0] == REQUEST_SENSE)) {
 cmd->host_scribble = (uchar *)hostdata->input_Q;
 hostdata->input_Q = cmd;
}
else{/* find the end of the queue */
for(tmp=(Scsi_Cmnd *)hostdata->input_Q; tmp->host_scribble;
 tmp=(Scsi_Cmnd *)tmp->host_scribble)
;
 tmp->host_scribble = (uchar *)cmd;
}

/* We know that there's at least one command in 'input_Q' now.
 * Go see if any of them are runnable!
 */

in2000_execute(cmd->host);

DB(DB_QUEUE_COMMAND,printk(")Q-%ld ",cmd->pid))

restore_flags(flags);
return0;
}



/*
 * This routine attempts to start a scsi command. If the host_card is
 * already connected, we give up immediately. Otherwise, look through
 * the input_Q, using the first command we find that's intended
 * for a currently non-busy target/lun.
 * Note that this function is always called with interrupts already
 * disabled (either from in2000_queuecommand() or in2000_intr()).
 */
static voidin2000_execute(struct Scsi_Host *instance)
{
struct IN2000_hostdata *hostdata;
Scsi_Cmnd *cmd, *prev;
int i;
unsigned short*sp;
unsigned short f;
unsigned short flushbuf[16];


 hostdata = (struct IN2000_hostdata *)instance->hostdata;

DB(DB_EXECUTE,printk("EX("))

if(hostdata->selecting || hostdata->connected) {

DB(DB_EXECUTE,printk(")EX-0 "))

return;
}

/*
 * Search through the input_Q for a command destined
 * for an idle target/lun.
 */

 cmd = (Scsi_Cmnd *)hostdata->input_Q;
 prev =0;
while(cmd) {
if(!(hostdata->busy[cmd->target] & (1<< cmd->lun)))
break;
 prev = cmd;
 cmd = (Scsi_Cmnd *)cmd->host_scribble;
}

/* quit if queue empty or all possible targets are busy */

if(!cmd) {

DB(DB_EXECUTE,printk(")EX-1 "))

return;
}

/* remove command from queue */

if(prev)
 prev->host_scribble = cmd->host_scribble;
else
 hostdata->input_Q = (Scsi_Cmnd *)cmd->host_scribble;

#ifdef PROC_STATISTICS
 hostdata->cmd_cnt[cmd->target]++;
#endif

/*
 * Start the selection process
 */

if(is_dir_out(cmd))
write_3393(hostdata,WD_DESTINATION_ID, cmd->target);
else
write_3393(hostdata,WD_DESTINATION_ID, cmd->target | DSTID_DPD);

/* Now we need to figure out whether or not this command is a good
 * candidate for disconnect/reselect. We guess to the best of our
 * ability, based on a set of hierarchical rules. When several
 * devices are operating simultaneously, disconnects are usually
 * an advantage. In a single device system, or if only 1 device
 * is being accessed, transfers usually go faster if disconnects
 * are not allowed:
 *
 * + Commands should NEVER disconnect if hostdata->disconnect =
 * DIS_NEVER (this holds for tape drives also), and ALWAYS
 * disconnect if hostdata->disconnect = DIS_ALWAYS.
 * + Tape drive commands should always be allowed to disconnect.
 * + Disconnect should be allowed if disconnected_Q isn't empty.
 * + Commands should NOT disconnect if input_Q is empty.
 * + Disconnect should be allowed if there are commands in input_Q
 * for a different target/lun. In this case, the other commands
 * should be made disconnect-able, if not already.
 *
 * I know, I know - this code would flunk me out of any
 * "C Programming 101" class ever offered. But it's easy
 * to change around and experiment with for now.
 */

 cmd->SCp.phase =0;/* assume no disconnect */
if(hostdata->disconnect == DIS_NEVER)
goto no;
if(hostdata->disconnect == DIS_ALWAYS)
goto yes;
if(cmd->device->type ==1)/* tape drive? */
goto yes;
if(hostdata->disconnected_Q)/* other commands disconnected? */
goto yes;
if(!(hostdata->input_Q))/* input_Q empty? */
goto no;
for(prev=(Scsi_Cmnd *)hostdata->input_Q; prev;
 prev=(Scsi_Cmnd *)prev->host_scribble) {
if((prev->target != cmd->target) || (prev->lun != cmd->lun)) {
for(prev=(Scsi_Cmnd *)hostdata->input_Q; prev;
 prev=(Scsi_Cmnd *)prev->host_scribble)
 prev->SCp.phase =1;
goto yes;
}
}
goto no;

yes:
 cmd->SCp.phase =1;

#ifdef PROC_STATISTICS
 hostdata->disc_allowed_cnt[cmd->target]++;
#endif

no:
write_3393(hostdata,WD_SOURCE_ID,((cmd->SCp.phase)?SRCID_ER:0));

write_3393(hostdata,WD_TARGET_LUN, cmd->lun);
write_3393(hostdata,WD_SYNCHRONOUS_TRANSFER,hostdata->sync_xfer[cmd->target]);
 hostdata->busy[cmd->target] |= (1<< cmd->lun);

if((hostdata->level2 <= L2_NONE) ||
(hostdata->sync_stat[cmd->target] == SS_UNSET)) {

/*
 * Do a 'Select-With-ATN' command. This will end with
 * one of the following interrupts:
 * CSR_RESEL_AM: failure - can try again later.
 * CSR_TIMEOUT: failure - give up.
 * CSR_SELECT: success - proceed.
 */

 hostdata->selecting = cmd;

/* Every target has its own synchronous transfer setting, kept in
 * the sync_xfer array, and a corresponding status byte in sync_stat[].
 * Each target's sync_stat[] entry is initialized to SS_UNSET, and its
 * sync_xfer[] entry is initialized to the default/safe value. SS_UNSET
 * means that the parameters are undetermined as yet, and that we
 * need to send an SDTR message to this device after selection is
 * complete. We set SS_FIRST to tell the interrupt routine to do so,
 * unless we don't want to even _try_ synchronous transfers: In this
 * case we set SS_SET to make the defaults final.
 */
if(hostdata->sync_stat[cmd->target] == SS_UNSET) {
if(hostdata->sync_off & (1<< cmd->target))
 hostdata->sync_stat[cmd->target] = SS_SET;
else
 hostdata->sync_stat[cmd->target] = SS_FIRST;
}
 hostdata->state = S_SELECTING;
write_3393_count(hostdata,0);/* this guarantees a DATA_PHASE interrupt */
write_3393_cmd(hostdata,WD_CMD_SEL_ATN);
}

else{

/*
 * Do a 'Select-With-ATN-Xfer' command. This will end with
 * one of the following interrupts:
 * CSR_RESEL_AM: failure - can try again later.
 * CSR_TIMEOUT: failure - give up.
 * anything else: success - proceed.
 */

 hostdata->connected = cmd;
write_3393(hostdata,WD_COMMAND_PHASE,0);

/* copy command_descriptor_block into WD chip
 * (take advantage of auto-incrementing)
 */

write1_io(WD_CDB_1, IO_WD_ADDR);
for(i=0; i<cmd->cmd_len; i++)
write1_io(cmd->cmnd[i], IO_WD_DATA);

/* The wd33c93 only knows about Group 0, 1, and 5 commands when
 * it's doing a 'select-and-transfer'. To be safe, we write the
 * size of the CDB into the OWN_ID register for every case. This
 * way there won't be problems with vendor-unique, audio, etc.
 */

write_3393(hostdata, WD_OWN_ID, cmd->cmd_len);

/* When doing a non-disconnect command, we can save ourselves a DATA
 * phase interrupt later by setting everything up now. With writes we
 * need to pre-fill the fifo; if there's room for the 32 flush bytes,
 * put them in there too - that'll avoid a fifo interrupt. Reads are
 * somewhat simpler.
 * KLUDGE NOTE: It seems that you can't completely fill the fifo here:
 * This results in the IO_FIFO_COUNT register rolling over to zero,
 * and apparently the gate array logic sees this as empty, not full,
 * so the 3393 chip is never signalled to start reading from the
 * fifo. Or maybe it's seen as a permanent fifo interrupt condition.
 * Regardless, we fix this by temporarily pretending that the fifo
 * is 16 bytes smaller. (I see now that the old driver has a comment
 * about "don't fill completely" in an analogous place - must be the
 * same deal.) This results in CDROM, swap partitions, and tape drives
 * needing an extra interrupt per write command - I think we can live
 * with that!
 */

if(!(cmd->SCp.phase)) {
write_3393_count(hostdata, cmd->SCp.this_residual);
write_3393(hostdata,WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_BUS);
write1_io(0, IO_FIFO_WRITE);/* clear fifo counter, write mode */

if(is_dir_out(cmd)) {
 hostdata->fifo = FI_FIFO_WRITING;
if((i = cmd->SCp.this_residual) > (IN2000_FIFO_SIZE -16) )
 i = IN2000_FIFO_SIZE -16;
 cmd->SCp.have_data_in = i;/* this much data in fifo */
 i >>=1;/* Gulp. Assuming modulo 2. */
 sp = (unsigned short*)cmd->SCp.ptr;
 f = hostdata->io_base + IO_FIFO;

#ifdef FAST_WRITE_IO

FAST_WRITE2_IO();
#else
while(i--)
write2_io(*sp++,IO_FIFO);

#endif

/* Is there room for the flush bytes? */

if(cmd->SCp.have_data_in <= ((IN2000_FIFO_SIZE -16) -32)) {
 sp = flushbuf;
 i =16;

#ifdef FAST_WRITE_IO

FAST_WRITE2_IO();
#else
while(i--)
write2_io(0,IO_FIFO);

#endif

}
}

else{
write1_io(0, IO_FIFO_READ);/* put fifo in read mode */
 hostdata->fifo = FI_FIFO_READING;
 cmd->SCp.have_data_in =0;/* nothing transfered yet */
}

}
else{
write_3393_count(hostdata,0);/* this guarantees a DATA_PHASE interrupt */
}
 hostdata->state = S_RUNNING_LEVEL2;
write_3393_cmd(hostdata,WD_CMD_SEL_ATN_XFER);
}

/*
 * Since the SCSI bus can handle only 1 connection at a time,
 * we get out of here now. If the selection fails, or when
 * the command disconnects, we'll come back to this routine
 * to search the input_Q again...
 */

DB(DB_EXECUTE,printk("%s%ld)EX-2 ",(cmd->SCp.phase)?"d:":"",cmd->pid))

}



static voidtransfer_pio(uchar *buf,int cnt,
int data_in_dir,struct IN2000_hostdata *hostdata)
{
uchar asr;

DB(DB_TRANSFER,printk("(%p,%d,%s)",buf,cnt,data_in_dir?"in":"out"))

write_3393(hostdata,WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
write_3393_count(hostdata,cnt);
write_3393_cmd(hostdata,WD_CMD_TRANS_INFO);
if(data_in_dir) {
do{
 asr =READ_AUX_STAT();
if(asr & ASR_DBR)
*buf++ =read_3393(hostdata,WD_DATA);
}while(!(asr & ASR_INT));
}
else{
do{
 asr =READ_AUX_STAT();
if(asr & ASR_DBR)
write_3393(hostdata,WD_DATA, *buf++);
}while(!(asr & ASR_INT));
}

/* Note: we are returning with the interrupt UN-cleared.
 * Since (presumably) an entire I/O operation has
 * completed, the bus phase is probably different, and
 * the interrupt routine will discover this when it
 * responds to the uncleared int.
 */

}



static voidtransfer_bytes(Scsi_Cmnd *cmd,int data_in_dir)
{
struct IN2000_hostdata *hostdata;
unsigned short*sp;
unsigned short f;
int i;

 hostdata = (struct IN2000_hostdata *)cmd->host->hostdata;

/* Normally, you'd expect 'this_residual' to be non-zero here.
 * In a series of scatter-gather transfers, however, this
 * routine will usually be called with 'this_residual' equal
 * to 0 and 'buffers_residual' non-zero. This means that a
 * previous transfer completed, clearing 'this_residual', and
 * now we need to setup the next scatter-gather buffer as the
 * source or destination for THIS transfer.
 */
if(!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
++cmd->SCp.buffer;
--cmd->SCp.buffers_residual;
 cmd->SCp.this_residual = cmd->SCp.buffer->length;
 cmd->SCp.ptr = cmd->SCp.buffer->address;
}

/* Set up hardware registers */

write_3393(hostdata,WD_SYNCHRONOUS_TRANSFER,hostdata->sync_xfer[cmd->target]);
write_3393_count(hostdata,cmd->SCp.this_residual);
write_3393(hostdata,WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_BUS);
write1_io(0,IO_FIFO_WRITE);/* zero counter, assume write */

/* Reading is easy. Just issue the command and return - we'll
 * get an interrupt later when we have actual data to worry about.
 */

if(data_in_dir) {
write1_io(0,IO_FIFO_READ);
if((hostdata->level2 >= L2_DATA) ||
(hostdata->level2 == L2_BASIC && cmd->SCp.phase ==0)) {
write_3393(hostdata,WD_COMMAND_PHASE,0x45);
write_3393_cmd(hostdata,WD_CMD_SEL_ATN_XFER);
 hostdata->state = S_RUNNING_LEVEL2;
}
else
write_3393_cmd(hostdata,WD_CMD_TRANS_INFO);
 hostdata->fifo = FI_FIFO_READING;
 cmd->SCp.have_data_in =0;
return;
}

/* Writing is more involved - we'll start the WD chip and write as
 * much data to the fifo as we can right now. Later interrupts will
 * write any bytes that don't make it at this stage.
 */

if((hostdata->level2 >= L2_DATA) ||
(hostdata->level2 == L2_BASIC && cmd->SCp.phase ==0)) {
write_3393(hostdata,WD_COMMAND_PHASE,0x45);
write_3393_cmd(hostdata,WD_CMD_SEL_ATN_XFER);
 hostdata->state = S_RUNNING_LEVEL2;
}
else
write_3393_cmd(hostdata,WD_CMD_TRANS_INFO);
 hostdata->fifo = FI_FIFO_WRITING;
 sp = (unsigned short*)cmd->SCp.ptr;

if((i = cmd->SCp.this_residual) > IN2000_FIFO_SIZE)
 i = IN2000_FIFO_SIZE;
 cmd->SCp.have_data_in = i;
 i >>=1;/* Gulp. We assume this_residual is modulo 2 */
 f = hostdata->io_base + IO_FIFO;

#ifdef FAST_WRITE_IO

FAST_WRITE2_IO();
#else
while(i--)
write2_io(*sp++,IO_FIFO);

#endif

}


/* We need to use spin_lock_irqsave() & spin_unlock_irqrestore() in this
 * function in order to work in an SMP environment. (I'd be surprised
 * if the driver is ever used by anyone on a real multi-CPU motherboard,
 * but it _does_ need to be able to compile and run in an SMP kernel.)
 */

static voidin2000_intr(int irqnum,void* dev_id,struct pt_regs *ptregs)
{
struct Scsi_Host *instance;
struct IN2000_hostdata *hostdata;
Scsi_Cmnd *patch, *cmd;
uchar asr, sr, phs, id, lun, *ucp, msg;
int i,j;
unsigned long length;
unsigned short*sp;
unsigned short f;
unsigned long flags;

for(instance = instance_list; instance; instance = instance->next) {
if(instance->irq == irqnum)
break;
}
if(!instance) {
printk("*** Hmm... interrupts are screwed up! ***\n");
return;
}
 hostdata = (struct IN2000_hostdata *)instance->hostdata;

/* Get the spin_lock and disable further ints, for SMP */

CLISPIN_LOCK(flags);

#ifdef PROC_STATISTICS
 hostdata->int_cnt++;
#endif

/* The IN2000 card has 2 interrupt sources OR'ed onto its IRQ line - the
 * WD3393 chip and the 2k fifo (which is actually a dual-port RAM combined
 * with a big logic array, so it's a little different than what you might
 * expect). As far as I know, there's no reason that BOTH can't be active
 * at the same time, but there's a problem: while we can read the 3393
 * to tell if _it_ wants an interrupt, I don't know of a way to ask the
 * fifo the same question. The best we can do is check the 3393 and if
 * it _isn't_ the source of the interrupt, then we can be pretty sure
 * that the fifo is the culprit.
 * UPDATE: I have it on good authority (Bill Earnest) that bit 0 of the
 * IO_FIFO_COUNT register mirrors the fifo interrupt state. I
 * assume that bit clear means interrupt active. As it turns
 * out, the driver really doesn't need to check for this after
 * all, so my remarks above about a 'problem' can safely be
 * ignored. The way the logic is set up, there's no advantage
 * (that I can see) to worrying about it.
 *
 * It seems that the fifo interrupt signal is negated when we extract
 * bytes during read or write bytes during write.
 * - fifo will interrupt when data is moving from it to the 3393, and
 * there are 31 (or less?) bytes left to go. This is sort of short-
 * sighted: what if you don't WANT to do more? In any case, our
 * response is to push more into the fifo - either actual data or
 * dummy bytes if need be. Note that we apparently have to write at
 * least 32 additional bytes to the fifo after an interrupt in order
 * to get it to release the ones it was holding on to - writing fewer
 * than 32 will result in another fifo int.
 * UPDATE: Again, info from Bill Earnest makes this more understandable:
 * 32 bytes = two counts of the fifo counter register. He tells
 * me that the fifo interrupt is a non-latching signal derived
 * from a straightforward boolean interpretation of the 7
 * highest bits of the fifo counter and the fifo-read/fifo-write
 * state. Who'd a thought?
 */

write1_io(0, IO_LED_ON);
 asr =READ_AUX_STAT();
if(!(asr & ASR_INT)) {/* no WD33c93 interrupt? */

/* Ok. This is definitely a FIFO-only interrupt.
 *
 * If FI_FIFO_READING is set, there are up to 2048 bytes waiting to be read,
 * maybe more to come from the SCSI bus. Read as many as we can out of the
 * fifo and into memory at the location of SCp.ptr[SCp.have_data_in], and
 * update have_data_in afterwards.
 *
 * If we have FI_FIFO_WRITING, the FIFO has almost run out of bytes to move
 * into the WD3393 chip (I think the interrupt happens when there are 31
 * bytes left, but it may be fewer...). The 3393 is still waiting, so we
 * shove some more into the fifo, which gets things moving again. If the
 * original SCSI command specified more than 2048 bytes, there may still
 * be some of that data left: fine - use it (from SCp.ptr[SCp.have_data_in]).
 * Don't forget to update have_data_in. If we've already written out the
 * entire buffer, feed 32 dummy bytes to the fifo - they're needed to
 * push out the remaining real data.
 * (Big thanks to Bill Earnest for getting me out of the mud in here.)
 */

 cmd = (Scsi_Cmnd *)hostdata->connected;/* assume we're connected */
CHECK_NULL(cmd,"fifo_int")

if(hostdata->fifo == FI_FIFO_READING) {

DB(DB_FIFO,printk("{R:%02x} ",read1_io(IO_FIFO_COUNT)))

 sp = (unsigned short*)(cmd->SCp.ptr + cmd->SCp.have_data_in);
 i =read1_io(IO_FIFO_COUNT) &0xfe;
 i <<=2;/* # of words waiting in the fifo */
 f = hostdata->io_base + IO_FIFO;

#ifdef FAST_READ_IO

FAST_READ2_IO();
#else
while(i--)
*sp++ =read2_io(IO_FIFO);

#endif

 i = sp - (unsigned short*)(cmd->SCp.ptr + cmd->SCp.have_data_in);
 i <<=1;
 cmd->SCp.have_data_in += i;
}

else if(hostdata->fifo == FI_FIFO_WRITING) {

DB(DB_FIFO,printk("{W:%02x} ",read1_io(IO_FIFO_COUNT)))

/* If all bytes have been written to the fifo, flush out the stragglers.
 * Note that while writing 16 dummy words seems arbitrary, we don't
 * have another choice that I can see. What we really want is to read
 * the 3393 transfer count register (that would tell us how many bytes
 * needed flushing), but the TRANSFER_INFO command hasn't completed
 * yet (not enough bytes!) and that register won't be accessible. So,
 * we use 16 words - a number obtained through trial and error.
 * UPDATE: Bill says this is exactly what Always does, so there.
 * More thanks due him for help in this section.
 */

if(cmd->SCp.this_residual == cmd->SCp.have_data_in) {
 i =16;
while(i--)/* write 32 dummy bytes */
write2_io(0,IO_FIFO);
}

/* If there are still bytes left in the SCSI buffer, write as many as we
 * can out to the fifo.
 */

else{
 sp = (unsigned short*)(cmd->SCp.ptr + cmd->SCp.have_data_in);
 i = cmd->SCp.this_residual - cmd->SCp.have_data_in;/* bytes yet to go */
 j =read1_io(IO_FIFO_COUNT) &0xfe;
 j <<=2;/* how many words the fifo has room for */
if((j <<1) > i)
 j = (i >>1);
while(j--)
write2_io(*sp++,IO_FIFO);

 i = sp - (unsigned short*)(cmd->SCp.ptr + cmd->SCp.have_data_in);
 i <<=1;
 cmd->SCp.have_data_in += i;
}
}

else{
printk("*** Spurious FIFO interrupt ***");
}

write1_io(0, IO_LED_OFF);

/* release the SMP spin_lock and restore irq state */
CLISPIN_UNLOCK(flags);
return;
}

/* This interrupt was triggered by the WD33c93 chip. The fifo interrupt
 * may also be asserted, but we don't bother to check it: we get more
 * detailed info from FIFO_READING and FIFO_WRITING (see below).
 */

 cmd = (Scsi_Cmnd *)hostdata->connected;/* assume we're connected */
 sr =read_3393(hostdata,WD_SCSI_STATUS);/* clear the interrupt */
 phs =read_3393(hostdata,WD_COMMAND_PHASE);

if(!cmd && (sr != CSR_RESEL_AM && sr != CSR_TIMEOUT && sr != CSR_SELECT)) {
printk("\nNR:wd-intr-1\n");
write1_io(0, IO_LED_OFF);

/* release the SMP spin_lock and restore irq state */
CLISPIN_UNLOCK(flags);
return;
}

DB(DB_INTR,printk("{%02x:%02x-",asr,sr))

/* After starting a FIFO-based transfer, the next _WD3393_ interrupt is
 * guaranteed to be in response to the completion of the transfer.
 * If we were reading, there's probably data in the fifo that needs
 * to be copied into RAM - do that here. Also, we have to update
 * 'this_residual' and 'ptr' based on the contents of the
 * TRANSFER_COUNT register, in case the device decided to do an
 * intermediate disconnect (a device may do this if it has to
 * do a seek, or just to be nice and let other devices have
 * some bus time during long transfers).
 * After doing whatever is necessary with the fifo, we go on and
 * service the WD3393 interrupt normally.
 */

if(hostdata->fifo == FI_FIFO_READING) {

/* buffer index = start-of-buffer + #-of-bytes-already-read */

 sp = (unsigned short*)(cmd->SCp.ptr + cmd->SCp.have_data_in);

/* bytes remaining in fifo = (total-wanted - #-not-got) - #-already-read */

 i = (cmd->SCp.this_residual -read_3393_count(hostdata)) - cmd->SCp.have_data_in;
 i >>=1;/* Gulp. We assume this will always be modulo 2 */
 f = hostdata->io_base + IO_FIFO;

#ifdef FAST_READ_IO

FAST_READ2_IO();
#else
while(i--)
*sp++ =read2_io(IO_FIFO);

#endif

 hostdata->fifo = FI_FIFO_UNUSED;
 length = cmd->SCp.this_residual;
 cmd->SCp.this_residual =read_3393_count(hostdata);
 cmd->SCp.ptr += (length - cmd->SCp.this_residual);

DB(DB_TRANSFER,printk("(%p,%d)",cmd->SCp.ptr,cmd->SCp.this_residual))

}

else if(hostdata->fifo == FI_FIFO_WRITING) {
 hostdata->fifo = FI_FIFO_UNUSED;
 length = cmd->SCp.this_residual;
 cmd->SCp.this_residual =read_3393_count(hostdata);
 cmd->SCp.ptr += (length - cmd->SCp.this_residual);

DB(DB_TRANSFER,printk("(%p,%d)",cmd->SCp.ptr,cmd->SCp.this_residual))

}

/* Respond to the specific WD3393 interrupt - there are quite a few! */

switch(sr) {

case CSR_TIMEOUT:
DB(DB_INTR,printk("TIMEOUT"))

if(hostdata->state == S_RUNNING_LEVEL2)
 hostdata->connected = NULL;
else{
 cmd = (Scsi_Cmnd *)hostdata->selecting;/* get a valid cmd */
CHECK_NULL(cmd,"csr_timeout")
 hostdata->selecting = NULL;
}

 cmd->result = DID_NO_CONNECT <<16;
 hostdata->busy[cmd->target] &= ~(1<< cmd->lun);
 hostdata->state = S_UNCONNECTED;
 cmd->scsi_done(cmd);

/* We are not connected to a target - check to see if there
 * are commands waiting to be executed.
 */

in2000_execute(instance);
break;


/* Note: this interrupt should not occur in a LEVEL2 command */

case CSR_SELECT:
DB(DB_INTR,printk("SELECT"))
 hostdata->connected = cmd = (Scsi_Cmnd *)hostdata->selecting;
CHECK_NULL(cmd,"csr_select")
 hostdata->selecting = NULL;

/* construct an IDENTIFY message with correct disconnect bit */

 hostdata->outgoing_msg[0] = (0x80|0x00| cmd->lun);
if(cmd->SCp.phase)
 hostdata->outgoing_msg[0] |=0x40;

if(hostdata->sync_stat[cmd->target] == SS_FIRST) {
#ifdef SYNC_DEBUG
printk(" sending SDTR ");
#endif

 hostdata->sync_stat[cmd->target] = SS_WAITING;

/* tack on a 2nd message to ask about synchronous transfers */

 hostdata->outgoing_msg[1] = EXTENDED_MESSAGE;
 hostdata->outgoing_msg[2] =3;
 hostdata->outgoing_msg[3] = EXTENDED_SDTR;
 hostdata->outgoing_msg[4] = OPTIMUM_SX_PER/4;
 hostdata->outgoing_msg[5] = OPTIMUM_SX_OFF;
 hostdata->outgoing_len =6;
}
else
 hostdata->outgoing_len =1;

 hostdata->state = S_CONNECTED;
break;


case CSR_XFER_DONE|PHS_DATA_IN:
case CSR_UNEXP |PHS_DATA_IN:
case CSR_SRV_REQ |PHS_DATA_IN:
DB(DB_INTR,printk("IN-%d.%d",cmd->SCp.this_residual,cmd->SCp.buffers_residual))
transfer_bytes(cmd, DATA_IN_DIR);
if(hostdata->state != S_RUNNING_LEVEL2)
 hostdata->state = S_CONNECTED;
break;


case CSR_XFER_DONE|PHS_DATA_OUT:
case CSR_UNEXP |PHS_DATA_OUT:
case CSR_SRV_REQ |PHS_DATA_OUT:
DB(DB_INTR,printk("OUT-%d.%d",cmd->SCp.this_residual,cmd->SCp.buffers_residual))
transfer_bytes(cmd, DATA_OUT_DIR);
if(hostdata->state != S_RUNNING_LEVEL2)
 hostdata->state = S_CONNECTED;
break;


/* Note: this interrupt should not occur in a LEVEL2 command */

case CSR_XFER_DONE|PHS_COMMAND:
case CSR_UNEXP |PHS_COMMAND:
case CSR_SRV_REQ |PHS_COMMAND:
DB(DB_INTR,printk("CMND-%02x,%ld",cmd->cmnd[0],cmd->pid))
transfer_pio(cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR, hostdata);
 hostdata->state = S_CONNECTED;
break;


case CSR_XFER_DONE|PHS_STATUS:
case CSR_UNEXP |PHS_STATUS:
case CSR_SRV_REQ |PHS_STATUS:
DB(DB_INTR,printk("STATUS="))

 cmd->SCp.Status =read_1_byte(hostdata);
DB(DB_INTR,printk("%02x",cmd->SCp.Status))
if(hostdata->level2 >= L2_BASIC) {
 sr =read_3393(hostdata,WD_SCSI_STATUS);/* clear interrupt */
 hostdata->state = S_RUNNING_LEVEL2;
write_3393(hostdata,WD_COMMAND_PHASE,0x50);
write_3393_cmd(hostdata,WD_CMD_SEL_ATN_XFER);
}
else{
 hostdata->state = S_CONNECTED;
}
break;


case CSR_XFER_DONE|PHS_MESS_IN:
case CSR_UNEXP |PHS_MESS_IN:
case CSR_SRV_REQ |PHS_MESS_IN:
DB(DB_INTR,printk("MSG_IN="))

 msg =read_1_byte(hostdata);
 sr =read_3393(hostdata,WD_SCSI_STATUS);/* clear interrupt */

 hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
if(hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
 msg = EXTENDED_MESSAGE;
else
 hostdata->incoming_ptr =0;

 cmd->SCp.Message = msg;
switch(msg) {

case COMMAND_COMPLETE:
DB(DB_INTR,printk("CCMP-%ld",cmd->pid))
write_3393_cmd(hostdata,WD_CMD_NEGATE_ACK);
 hostdata->state = S_PRE_CMP_DISC;
break;

case SAVE_POINTERS:
DB(DB_INTR,printk("SDP"))
write_3393_cmd(hostdata,WD_CMD_NEGATE_ACK);
 hostdata->state = S_CONNECTED;
break;

case RESTORE_POINTERS:
DB(DB_INTR,printk("RDP"))
if(hostdata->level2 >= L2_BASIC) {
write_3393(hostdata,WD_COMMAND_PHASE,0x45);
write_3393_cmd(hostdata,WD_CMD_SEL_ATN_XFER);
 hostdata->state = S_RUNNING_LEVEL2;
}
else{
write_3393_cmd(hostdata,WD_CMD_NEGATE_ACK);
 hostdata->state = S_CONNECTED;
}
break;

case DISCONNECT:
DB(DB_INTR,printk("DIS"))
 cmd->device->disconnect =1;
write_3393_cmd(hostdata,WD_CMD_NEGATE_ACK);
 hostdata->state = S_PRE_TMP_DISC;
break;

case MESSAGE_REJECT:
DB(DB_INTR,printk("REJ"))
#ifdef SYNC_DEBUG
printk("-REJ-");
#endif
if(hostdata->sync_stat[cmd->target] == SS_WAITING)
 hostdata->sync_stat[cmd->target] = SS_SET;
write_3393_cmd(hostdata,WD_CMD_NEGATE_ACK);
 hostdata->state = S_CONNECTED;
break;

case EXTENDED_MESSAGE:
DB(DB_INTR,printk("EXT"))

 ucp = hostdata->incoming_msg;

#ifdef SYNC_DEBUG
printk("%02x",ucp[hostdata->incoming_ptr]);
#endif
/* Is this the last byte of the extended message? */

if((hostdata->incoming_ptr >=2) &&
(hostdata->incoming_ptr == (ucp[1] +1))) {

switch(ucp[2]) {/* what's the EXTENDED code? */
case EXTENDED_SDTR:
 id =calc_sync_xfer(ucp[3],ucp[4]);
if(hostdata->sync_stat[cmd->target] != SS_WAITING) {

/* A device has sent an unsolicited SDTR message; rather than go
 * through the effort of decoding it and then figuring out what
 * our reply should be, we're just gonna say that we have a
 * synchronous fifo depth of 0. This will result in asynchronous
 * transfers - not ideal but so much easier.
 * Actually, this is OK because it assures us that if we don't
 * specifically ask for sync transfers, we won't do any.
 */

write_3393_cmd(hostdata,WD_CMD_ASSERT_ATN);/* want MESS_OUT */
 hostdata->outgoing_msg[0] = EXTENDED_MESSAGE;
 hostdata->outgoing_msg[1] =3;
 hostdata->outgoing_msg[2] = EXTENDED_SDTR;
 hostdata->outgoing_msg[3] = hostdata->default_sx_per/4;
 hostdata->outgoing_msg[4] =0;
 hostdata->outgoing_len =5;
 hostdata->sync_xfer[cmd->target] =
calc_sync_xfer(hostdata->default_sx_per/4,0);
}
else{
 hostdata->sync_xfer[cmd->target] = id;
}
#ifdef SYNC_DEBUG
printk("sync_xfer=%02x",hostdata->sync_xfer[cmd->target]);
#endif
 hostdata->sync_stat[cmd->target] = SS_SET;
write_3393_cmd(hostdata,WD_CMD_NEGATE_ACK);
 hostdata->state = S_CONNECTED;
break;
case EXTENDED_WDTR:
write_3393_cmd(hostdata,WD_CMD_ASSERT_ATN);/* want MESS_OUT */
printk("sending WDTR ");
 hostdata->outgoing_msg[0] = EXTENDED_MESSAGE;
 hostdata->outgoing_msg[1] =2;
 hostdata->outgoing_msg[2] = EXTENDED_WDTR;
 hostdata->outgoing_msg[3] =0;/* 8 bit transfer width */
 hostdata->outgoing_len =4;
write_3393_cmd(hostdata,WD_CMD_NEGATE_ACK);
 hostdata->state = S_CONNECTED;
break;
default:
write_3393_cmd(hostdata,WD_CMD_ASSERT_ATN);/* want MESS_OUT */
printk("Rejecting Unknown Extended Message(%02x). ",ucp[2]);
 hostdata->outgoing_msg[0] = MESSAGE_REJECT;
 hostdata->outgoing_len =1;
write_3393_cmd(hostdata,WD_CMD_NEGATE_ACK);
 hostdata->state = S_CONNECTED;
break;
}
 hostdata->incoming_ptr =0;
}

/* We need to read more MESS_IN bytes for the extended message */

else{
 hostdata->incoming_ptr++;
write_3393_cmd(hostdata,WD_CMD_NEGATE_ACK);
 hostdata->state = S_CONNECTED;
}
break;

default:
printk("Rejecting Unknown Message(%02x) ",msg);
write_3393_cmd(hostdata,WD_CMD_ASSERT_ATN);/* want MESS_OUT */
 hostdata->outgoing_msg[0] = MESSAGE_REJECT;
 hostdata->outgoing_len =1;
write_3393_cmd(hostdata,WD_CMD_NEGATE_ACK);
 hostdata->state = S_CONNECTED;
}
break;


/* Note: this interrupt will occur only after a LEVEL2 command */

case CSR_SEL_XFER_DONE:

/* Make sure that reselection is enabled at this point - it may
 * have been turned off for the command that just completed.
 */

write_3393(hostdata,WD_SOURCE_ID, SRCID_ER);
if(phs ==0x60) {
DB(DB_INTR,printk("SX-DONE-%ld",cmd->pid))
 cmd->SCp.Message = COMMAND_COMPLETE;
 lun =read_3393(hostdata,WD_TARGET_LUN);
DB(DB_INTR,printk(":%d.%d",cmd->SCp.Status,lun))
 hostdata->connected = NULL;
 hostdata->busy[cmd->target] &= ~(1<< cmd->lun);
 hostdata->state = S_UNCONNECTED;
if(cmd->SCp.Status == ILLEGAL_STATUS_BYTE)
 cmd->SCp.Status = lun;
if(cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
 cmd->result = (cmd->result &0x00ffff) | (DID_ERROR <<16);
else
 cmd->result = cmd->SCp.Status | (cmd->SCp.Message <<8);
 cmd->scsi_done(cmd);

/* We are no longer connected to a target - check to see if
 * there are commands waiting to be executed.
 */

in2000_execute(instance);
}
else{
printk("%02x:%02x:%02x-%ld: Unknown SEL_XFER_DONE phase!!---",asr,sr,phs,cmd->pid);
}
break;


/* Note: this interrupt will occur only after a LEVEL2 command */

case CSR_SDP:
DB(DB_INTR,printk("SDP"))
 hostdata->state = S_RUNNING_LEVEL2;
write_3393(hostdata,WD_COMMAND_PHASE,0x41);
write_3393_cmd(hostdata,WD_CMD_SEL_ATN_XFER);
break;


case CSR_XFER_DONE|PHS_MESS_OUT:
case CSR_UNEXP |PHS_MESS_OUT:
case CSR_SRV_REQ |PHS_MESS_OUT:
DB(DB_INTR,printk("MSG_OUT="))

/* To get here, we've probably requested MESSAGE_OUT and have
 * already put the correct bytes in outgoing_msg[] and filled
 * in outgoing_len. We simply send them out to the SCSI bus.
 * Sometimes we get MESSAGE_OUT phase when we're not expecting
 * it - like when our SDTR message is rejected by a target. Some
 * targets send the REJECT before receiving all of the extended
 * message, and then seem to go back to MESSAGE_OUT for a byte
 * or two. Not sure why, or if I'm doing something wrong to
 * cause this to happen. Regardless, it seems that sending
 * NOP messages in these situations results in no harm and
 * makes everyone happy.
 */

if(hostdata->outgoing_len ==0) {
 hostdata->outgoing_len =1;
 hostdata->outgoing_msg[0] = NOP;
}
transfer_pio(hostdata->outgoing_msg, hostdata->outgoing_len,
 DATA_OUT_DIR, hostdata);
DB(DB_INTR,printk("%02x",hostdata->outgoing_msg[0]))
 hostdata->outgoing_len =0;
 hostdata->state = S_CONNECTED;
break;


case CSR_UNEXP_DISC:

/* I think I've seen this after a request-sense that was in response
 * to an error condition, but not sure. We certainly need to do
 * something when we get this interrupt - the question is 'what?'.
 * Let's think positively, and assume some command has finished
 * in a legal manner (like a command that provokes a request-sense),
 * so we treat it as a normal command-complete-disconnect.
 */


/* Make sure that reselection is enabled at this point - it may
 * have been turned off for the command that just completed.
 */

write_3393(hostdata,WD_SOURCE_ID, SRCID_ER);
if(cmd == NULL) {
printk(" - Already disconnected! ");
 hostdata->state = S_UNCONNECTED;

/* release the SMP spin_lock and restore irq state */
CLISPIN_UNLOCK(flags);
return;
}
DB(DB_INTR,printk("UNEXP_DISC-%ld",cmd->pid))
 hostdata->connected = NULL;
 hostdata->busy[cmd->target] &= ~(1<< cmd->lun);
 hostdata->state = S_UNCONNECTED;
if(cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
 cmd->result = (cmd->result &0x00ffff) | (DID_ERROR <<16);
else
 cmd->result = cmd->SCp.Status | (cmd->SCp.Message <<8);
 cmd->scsi_done(cmd);

/* We are no longer connected to a target - check to see if
 * there are commands waiting to be executed.
 */

in2000_execute(instance);
break;


case CSR_DISC:

/* Make sure that reselection is enabled at this point - it may
 * have been turned off for the command that just completed.
 */

write_3393(hostdata,WD_SOURCE_ID, SRCID_ER);
DB(DB_INTR,printk("DISC-%ld",cmd->pid))
if(cmd == NULL) {
printk(" - Already disconnected! ");
 hostdata->state = S_UNCONNECTED;
}
switch(hostdata->state) {
case S_PRE_CMP_DISC:
 hostdata->connected = NULL;
 hostdata->busy[cmd->target] &= ~(1<< cmd->lun);
 hostdata->state = S_UNCONNECTED;
DB(DB_INTR,printk(":%d",cmd->SCp.Status))
if(cmd->cmnd[0] == REQUEST_SENSE && cmd->SCp.Status != GOOD)
 cmd->result = (cmd->result &0x00ffff) | (DID_ERROR <<16);
else
 cmd->result = cmd->SCp.Status | (cmd->SCp.Message <<8);
 cmd->scsi_done(cmd);
break;
case S_PRE_TMP_DISC:
case S_RUNNING_LEVEL2:
 cmd->host_scribble = (uchar *)hostdata->disconnected_Q;
 hostdata->disconnected_Q = cmd;
 hostdata->connected = NULL;
 hostdata->state = S_UNCONNECTED;

#ifdef PROC_STATISTICS
 hostdata->disc_done_cnt[cmd->target]++;
#endif

break;
default:
printk("*** Unexpected DISCONNECT interrupt! ***");
 hostdata->state = S_UNCONNECTED;
}

/* We are no longer connected to a target - check to see if
 * there are commands waiting to be executed.
 */

in2000_execute(instance);
break;


case CSR_RESEL_AM:
DB(DB_INTR,printk("RESEL"))

/* First we have to make sure this reselection didn't */
/* happen during Arbitration/Selection of some other device. */
/* If yes, put losing command back on top of input_Q. */

if(hostdata->level2 <= L2_NONE) {

if(hostdata->selecting) {
 cmd = (Scsi_Cmnd *)hostdata->selecting;
 hostdata->selecting = NULL;
 hostdata->busy[cmd->target] &= ~(1<< cmd->lun);
 cmd->host_scribble = (uchar *)hostdata->input_Q;
 hostdata->input_Q = cmd;
}
}

else{

if(cmd) {
if(phs ==0x00) {
 hostdata->busy[cmd->target] &= ~(1<< cmd->lun);
 cmd->host_scribble = (uchar *)hostdata->input_Q;
 hostdata->input_Q = cmd;
}
else{
printk("---%02x:%02x:%02x-TROUBLE: Intrusive ReSelect!---",asr,sr,phs);
while(1)
printk("\r");
}
}

}

/* OK - find out which device reselected us. */

 id =read_3393(hostdata,WD_SOURCE_ID);
 id &= SRCID_MASK;

/* and extract the lun from the ID message. (Note that we don't
 * bother to check for a valid message here - I guess this is
 * not the right way to go, but....)
 */

 lun =read_3393(hostdata,WD_DATA);
if(hostdata->level2 < L2_RESELECT)
write_3393_cmd(hostdata,WD_CMD_NEGATE_ACK);
 lun &=7;

/* Now we look for the command that's reconnecting. */

 cmd = (Scsi_Cmnd *)hostdata->disconnected_Q;
 patch = NULL;
while(cmd) {
if(id == cmd->target && lun == cmd->lun)
break;
 patch = cmd;
 cmd = (Scsi_Cmnd *)cmd->host_scribble;
}

/* Hmm. Couldn't find a valid command.... What to do? */

if(!cmd) {
printk("---TROUBLE: target %d.%d not in disconnect queue---",id,lun);
break;
}

/* Ok, found the command - now start it up again. */

if(patch)
 patch->host_scribble = cmd->host_scribble;
else
 hostdata->disconnected_Q = (Scsi_Cmnd *)cmd->host_scribble;
 hostdata->connected = cmd;

/* We don't need to worry about 'initialize_SCp()' or 'hostdata->busy[]'
 * because these things are preserved over a disconnect.
 * But we DO need to fix the DPD bit so it's correct for this command.
 */

if(is_dir_out(cmd))
write_3393(hostdata,WD_DESTINATION_ID,cmd->target);
else
write_3393(hostdata,WD_DESTINATION_ID,cmd->target | DSTID_DPD);
if(hostdata->level2 >= L2_RESELECT) {
write_3393_count(hostdata,0);/* we want a DATA_PHASE interrupt */
write_3393(hostdata,WD_COMMAND_PHASE,0x45);
write_3393_cmd(hostdata,WD_CMD_SEL_ATN_XFER);
 hostdata->state = S_RUNNING_LEVEL2;
}
else
 hostdata->state = S_CONNECTED;

DB(DB_INTR,printk("-%ld",cmd->pid))
break;

default:
printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--",asr,sr,phs);
}

write1_io(0, IO_LED_OFF);

DB(DB_INTR,printk("} "))

/* release the SMP spin_lock and restore irq state */
CLISPIN_UNLOCK(flags);

}



#define RESET_CARD 0
#define RESET_CARD_AND_BUS 1
#define B_FLAG 0x80

static intreset_hardware(struct Scsi_Host *instance,int type)
{
struct IN2000_hostdata *hostdata;
int qt,x;
unsigned long flags;

 hostdata = (struct IN2000_hostdata *)instance->hostdata;

write1_io(0, IO_LED_ON);
if(type == RESET_CARD_AND_BUS) {
write1_io(0,IO_CARD_RESET);
 x =read1_io(IO_HARDWARE);
}
 x =read_3393(hostdata,WD_SCSI_STATUS);/* clear any WD intrpt */
write_3393(hostdata,WD_OWN_ID, instance->this_id |
 OWNID_EAF | OWNID_RAF | OWNID_FS_8);
write_3393(hostdata,WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
write_3393(hostdata,WD_SYNCHRONOUS_TRANSFER,
calc_sync_xfer(hostdata->default_sx_per/4,DEFAULT_SX_OFF));
save_flags(flags);
cli();
write1_io(0,IO_FIFO_WRITE);/* clear fifo counter */
write1_io(0,IO_FIFO_READ);/* start fifo out in read mode */
write_3393(hostdata,WD_COMMAND, WD_CMD_RESET);
while(!(READ_AUX_STAT() & ASR_INT))
;/* wait for RESET to complete */

 x =read_3393(hostdata,WD_SCSI_STATUS);/* clear interrupt */
restore_flags(flags);
write_3393(hostdata,WD_QUEUE_TAG,0xa5);/* any random number */
 qt =read_3393(hostdata,WD_QUEUE_TAG);
if(qt ==0xa5) {
 x |= B_FLAG;
write_3393(hostdata,WD_QUEUE_TAG,0);
}
write_3393(hostdata,WD_TIMEOUT_PERIOD, TIMEOUT_PERIOD_VALUE);
write_3393(hostdata,WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
write1_io(0, IO_LED_OFF);
return x;
}



intin2000_reset(Scsi_Cmnd *cmd,unsigned int reset_flags)
{
unsigned long flags;
struct Scsi_Host *instance;
struct IN2000_hostdata *hostdata;
int x;

 instance = cmd->host;
 hostdata = (struct IN2000_hostdata *)instance->hostdata;

printk("scsi%d: Reset. ", instance->host_no);
save_flags(flags);
cli();

/* do scsi-reset here */

reset_hardware(instance, RESET_CARD_AND_BUS);
for(x =0; x <8; x++) {
 hostdata->busy[x] =0;
 hostdata->sync_xfer[x] =calc_sync_xfer(DEFAULT_SX_PER/4,DEFAULT_SX_OFF);
 hostdata->sync_stat[x] = SS_UNSET;/* using default sync values */
}
 hostdata->input_Q = NULL;
 hostdata->selecting = NULL;
 hostdata->connected = NULL;
 hostdata->disconnected_Q = NULL;
 hostdata->state = S_UNCONNECTED;
 hostdata->fifo = FI_FIFO_UNUSED;
 hostdata->incoming_ptr =0;
 hostdata->outgoing_len =0;

 cmd->result = DID_RESET <<16;
restore_flags(flags);
return0;
}



intin2000_abort(Scsi_Cmnd *cmd)
{
struct Scsi_Host *instance;
struct IN2000_hostdata *hostdata;
Scsi_Cmnd *tmp, *prev;
unsigned long flags;
uchar sr, asr;
unsigned long timeout;

save_flags(flags);
cli();

 instance = cmd->host;
 hostdata = (struct IN2000_hostdata *)instance->hostdata;

printk("scsi%d: Abort-", instance->host_no);
printk("(asr=%02x,count=%ld,resid=%d,buf_resid=%d,have_data=%d,FC=%02x)- ",
READ_AUX_STAT(),read_3393_count(hostdata),cmd->SCp.this_residual,cmd->SCp.buffers_residual,
 cmd->SCp.have_data_in,read1_io(IO_FIFO_COUNT));

/*
 * Case 1 : If the command hasn't been issued yet, we simply remove it
 * from the inout_Q.
 */

 tmp = (Scsi_Cmnd *)hostdata->input_Q;
 prev =0;
while(tmp) {
if(tmp == cmd) {
if(prev)
 prev->host_scribble = cmd->host_scribble;
 cmd->host_scribble = NULL;
 cmd->result = DID_ABORT <<16;
printk("scsi%d: Abort - removing command %ld from input_Q. ",
 instance->host_no, cmd->pid);
 cmd->scsi_done(cmd);
restore_flags(flags);
return SCSI_ABORT_SUCCESS;
}
 prev = tmp;
 tmp = (Scsi_Cmnd *)tmp->host_scribble;
}

/*
 * Case 2 : If the command is connected, we're going to fail the abort
 * and let the high level SCSI driver retry at a later time or
 * issue a reset.
 *
 * Timeouts, and therefore aborted commands, will be highly unlikely
 * and handling them cleanly in this situation would make the common
 * case of noresets less efficient, and would pollute our code. So,
 * we fail.
 */

if(hostdata->connected == cmd) {

printk("scsi%d: Aborting connected command %ld - ",
 instance->host_no, cmd->pid);

printk("sending wd33c93 ABORT command - ");
write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
write_3393_cmd(hostdata, WD_CMD_ABORT);

/* Now we have to attempt to flush out the FIFO... */

printk("flushing fifo - ");
 timeout =1000000;
do{
 asr =READ_AUX_STAT();
if(asr & ASR_DBR)
read_3393(hostdata, WD_DATA);
}while(!(asr & ASR_INT) && timeout-- >0);
 sr =read_3393(hostdata, WD_SCSI_STATUS);
printk("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ",
 asr, sr,read_3393_count(hostdata), timeout);

/*
 * Abort command processed.
 * Still connected.
 * We must disconnect.
 */

printk("sending wd33c93 DISCONNECT command - ");
write_3393_cmd(hostdata, WD_CMD_DISCONNECT);

 timeout =1000000;
 asr =READ_AUX_STAT();
while((asr & ASR_CIP) && timeout-- >0)
 asr =READ_AUX_STAT();
 sr =read_3393(hostdata, WD_SCSI_STATUS);
printk("asr=%02x, sr=%02x.",asr,sr);

 hostdata->busy[cmd->target] &= ~(1<< cmd->lun);
 hostdata->connected = NULL;
 hostdata->state = S_UNCONNECTED;
 cmd->result = DID_ABORT <<16;
 cmd->scsi_done(cmd);

in2000_execute(instance);

restore_flags(flags);
return SCSI_ABORT_SUCCESS;
}

/*
 * Case 3: If the command is currently disconnected from the bus,
 * we're not going to expend much effort here: Let's just return
 * an ABORT_SNOOZE and hope for the best...
 */

for(tmp=(Scsi_Cmnd *)hostdata->disconnected_Q; tmp;
 tmp=(Scsi_Cmnd *)tmp->host_scribble)
if(cmd == tmp) {
restore_flags(flags);
printk("Sending ABORT_SNOOZE. ");
return SCSI_ABORT_SNOOZE;
}

/*
 * Case 4 : If we reached this point, the command was not found in any of
 * the queues.
 *
 * We probably reached this point because of an unlikely race condition
 * between the command completing successfully and the abortion code,
 * so we won't panic, but we will notify the user in case something really
 * broke.
 */

in2000_execute(instance);

restore_flags(flags);
printk("scsi%d: warning : SCSI command probably completed successfully"
" before abortion. ", instance->host_no);
return SCSI_ABORT_NOT_RUNNING;
}



#define MAX_IN2000_HOSTS 3
#define MAX_SETUP_ARGS (sizeof(setup_args) / sizeof(char *))
#define SETUP_BUFFER_SIZE 200
static char setup_buffer[SETUP_BUFFER_SIZE];
static char setup_used[MAX_SETUP_ARGS];
static int done_setup =0;

void __init in2000_setup(char*str,int*ints)
{
int i;
char*p1,*p2;

strncpy(setup_buffer,str,SETUP_BUFFER_SIZE);
 setup_buffer[SETUP_BUFFER_SIZE -1] ='\0';
 p1 = setup_buffer;
 i =0;
while(*p1 && (i < MAX_SETUP_ARGS)) {
 p2 =strchr(p1,',');
if(p2) {
*p2 ='\0';
if(p1 != p2)
 setup_args[i] = p1;
 p1 = p2 +1;
 i++;
}
else{
 setup_args[i] = p1;
break;
}
}
for(i=0; i<MAX_SETUP_ARGS; i++)
 setup_used[i] =0;
 done_setup =1;
}


/* check_setup_args() returns index if key found, 0 if not
 */

static int __init check_setup_args(char*key,int*flags,int*val,char*buf)
{
int x;
char*cp;

for(x=0; x<MAX_SETUP_ARGS; x++) {
if(setup_used[x])
continue;
if(!strncmp(setup_args[x], key,strlen(key)))
break;
}
if(x == MAX_SETUP_ARGS)
return0;
 setup_used[x] =1;
 cp = setup_args[x] +strlen(key);
*val = -1;
if(*cp !=':')
return++x;
 cp++;
if((*cp >='0') && (*cp <='9')) {
*val =simple_strtoul(cp,NULL,0);
}
return++x;
}



/* The "correct" (ie portable) way to access memory-mapped hardware
 * such as the IN2000 EPROM and dip switch is through the use of
 * special macros declared in 'asm/io.h'. We use readb() and readl()
 * when reading from the card's BIOS area in in2000_detect().
 */
static const unsigned int*bios_tab[] in2000__INITDATA = {
(unsigned int*)0xc8000,
(unsigned int*)0xd0000,
(unsigned int*)0xd8000,
0
};

static const unsigned short base_tab[] in2000__INITDATA = {
0x220,
0x200,
0x110,
0x100,
};

static const int int_tab[] in2000__INITDATA = {
15,
14,
11,
10
};


int __init in2000_detect(Scsi_Host_Template * tpnt)
{
struct Scsi_Host *instance;
struct IN2000_hostdata *hostdata;
int detect_count;
int bios;
int x;
unsigned short base;
uchar switches;
uchar hrev;
int flags;
int val;
char buf[32];

/* Thanks to help from Bill Earnest, probing for IN2000 cards is a
 * pretty straightforward and fool-proof operation. There are 3
 * possible locations for the IN2000 EPROM in memory space - if we
 * find a BIOS signature, we can read the dip switch settings from
 * the byte at BIOS+32 (shadowed in by logic on the card). From 2
 * of the switch bits we get the card's address in IO space. There's
 * an image of the dip switch there, also, so we have a way to back-
 * check that this really is an IN2000 card. Very nifty. Use the
 * 'ioport:xx' command-line parameter if your BIOS EPROM is absent
 * or disabled.
 */

if(!done_setup && setup_strings)
in2000_setup(setup_strings,0);

 detect_count =0;
for(bios =0; bios_tab[bios]; bios++) {
if(check_setup_args("ioport",&flags,&val,buf)) {
 base = val;
 switches = ~inb(base + IO_SWITCHES) &0xff;
printk("Forcing IN2000 detection at IOport 0x%x ",base);
 bios =2;
}
/*
 * There have been a couple of BIOS versions with different layouts
 * for the obvious ID strings. We look for the 2 most common ones and
 * hope that they cover all the cases...
 */
else if(readl(bios_tab[bios]+0x04) ==0x41564f4e||
readl(bios_tab[bios]+0x0c) ==0x61776c41) {
printk("Found IN2000 BIOS at 0x%x ",(unsigned int)bios_tab[bios]);

/* Read the switch image that's mapped into EPROM space */

 switches = ~((readb(bios_tab[bios]+0x08) &0xff));

/* Find out where the IO space is */

 x = switches & (SW_ADDR0 | SW_ADDR1);
 base = base_tab[x];

/* Check for the IN2000 signature in IO space. */

 x = ~inb(base + IO_SWITCHES) &0xff;
if(x != switches) {
printk("Bad IO signature: %02x vs %02x.\n",x,switches);
continue;
}
}
else
continue;

/* OK. We have a base address for the IO ports - run a few safety checks */

if(!(switches & SW_BIT7)) {/* I _think_ all cards do this */
printk("There is no IN-2000 SCSI card at IOport 0x%03x!\n",base);
continue;
}

/* Let's assume any hardware version will work, although the driver
 * has only been tested on 0x21, 0x22, 0x25, 0x26, and 0x27. We'll
 * print out the rev number for reference later, but accept them all.
 */

 hrev =inb(base + IO_HARDWARE);

/* Bit 2 tells us if interrupts are disabled */
if(switches & SW_DISINT) {
printk("The IN-2000 SCSI card at IOport 0x%03x ",base);
printk("is not configured for interrupt operation!\n");
printk("This driver requires an interrupt: cancelling detection.\n");
continue;
}

/* Ok. We accept that there's an IN2000 at ioaddr 'base'. Now
 * initialize it.
 */

 tpnt->proc_dir = &proc_scsi_in2000;/* done more than once? harmless. */
 detect_count++;
 instance =scsi_register(tpnt,sizeof(struct IN2000_hostdata));
if(!instance_list)
 instance_list = instance;
 hostdata = (struct IN2000_hostdata *)instance->hostdata;
 instance->io_port = hostdata->io_base = base;
 hostdata->dip_switch = switches;
 hostdata->hrev = hrev;

write1_io(0,IO_FIFO_WRITE);/* clear fifo counter */
write1_io(0,IO_FIFO_READ);/* start fifo out in read mode */
write1_io(0,IO_INTR_MASK);/* allow all ints */
 x = int_tab[(switches & (SW_INT0 | SW_INT1)) >> SW_INT_SHIFT];
if(request_irq(x, in2000_intr, SA_INTERRUPT,"in2000", NULL)) {
printk("in2000_detect: Unable to allocate IRQ.\n");
 detect_count--;
continue;
}
 instance->irq = x;
 instance->n_io_port =13;
request_region(base,13,"in2000");/* lock in this IO space for our use */

for(x =0; x <8; x++) {
 hostdata->busy[x] =0;
 hostdata->sync_xfer[x] =calc_sync_xfer(DEFAULT_SX_PER/4,DEFAULT_SX_OFF);
 hostdata->sync_stat[x] = SS_UNSET;/* using default sync values */
#ifdef PROC_STATISTICS
 hostdata->cmd_cnt[x] =0;
 hostdata->disc_allowed_cnt[x] =0;
 hostdata->disc_done_cnt[x] =0;
#endif
}
 hostdata->input_Q = NULL;
 hostdata->selecting = NULL;
 hostdata->connected = NULL;
 hostdata->disconnected_Q = NULL;
 hostdata->state = S_UNCONNECTED;
 hostdata->fifo = FI_FIFO_UNUSED;
 hostdata->level2 = L2_BASIC;
 hostdata->disconnect = DIS_ADAPTIVE;
 hostdata->args = DEBUG_DEFAULTS;
 hostdata->incoming_ptr =0;
 hostdata->outgoing_len =0;
 hostdata->default_sx_per = DEFAULT_SX_PER;

/* Older BIOS's had a 'sync on/off' switch - use its setting */

if(readl(bios_tab[bios]+0x04) ==0x41564f4e&& (switches & SW_SYNC_DOS5))
 hostdata->sync_off =0x00;/* sync defaults to on */
else
 hostdata->sync_off =0xff;/* sync defaults to off */

#ifdef PROC_INTERFACE
 hostdata->proc = PR_VERSION|PR_INFO|PR_STATISTICS|
 PR_CONNECTED|PR_INPUTQ|PR_DISCQ|
 PR_STOP;
#ifdef PROC_STATISTICS
 hostdata->int_cnt =0;
#endif
#endif

if(check_setup_args("nosync",&flags,&val,buf))
 hostdata->sync_off = val;

if(check_setup_args("period",&flags,&val,buf))
 hostdata->default_sx_per = sx_table[round_period((unsigned int)val)].period_ns;

if(check_setup_args("disconnect",&flags,&val,buf)) {
if((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
 hostdata->disconnect = val;
else
 hostdata->disconnect = DIS_ADAPTIVE;
}

if(check_setup_args("noreset",&flags,&val,buf))
 hostdata->args ^= A_NO_SCSI_RESET;

if(check_setup_args("level2",&flags,&val,buf))
 hostdata->level2 = val;

if(check_setup_args("debug",&flags,&val,buf))
 hostdata->args = (val & DB_MASK);

#ifdef PROC_INTERFACE
if(check_setup_args("proc",&flags,&val,buf))
 hostdata->proc = val;
#endif


 x =reset_hardware(instance,(hostdata->args & A_NO_SCSI_RESET)?RESET_CARD:RESET_CARD_AND_BUS);

 hostdata->microcode =read_3393(hostdata,WD_CDB_1);
if(x &0x01) {
if(x & B_FLAG)
 hostdata->chip = C_WD33C93B;
else
 hostdata->chip = C_WD33C93A;
}
else
 hostdata->chip = C_WD33C93;

printk("dip_switch=%02x irq=%d ioport=%02x floppy=%s sync/DOS5=%s ",
(switches &0x7f),
 instance->irq,hostdata->io_base,
(switches & SW_FLOPPY)?"Yes":"No",
(switches & SW_SYNC_DOS5)?"Yes":"No");
printk("hardware_ver=%02x chip=%s microcode=%02x\n",
 hrev,
(hostdata->chip==C_WD33C93)?"WD33c93":
(hostdata->chip==C_WD33C93A)?"WD33c93A":
(hostdata->chip==C_WD33C93B)?"WD33c93B":"unknown",
 hostdata->microcode);
#ifdef DEBUGGING_ON
printk("setup_args = ");
for(x=0; x<MAX_SETUP_ARGS; x++)
printk("%s,",setup_args[x]);
printk("\n");
#endif
if(hostdata->sync_off ==0xff)
printk("Sync-transfer DISABLED on all devices: ENABLE from command-line\n");
printk("IN2000 driver version %s - %s\n",IN2000_VERSION,IN2000_DATE);
}

return detect_count;
}


/* NOTE: I lifted this function straight out of the old driver,
 * and have not tested it. Presumably it does what it's
 * supposed to do...
 */

intin2000_biosparam(Disk *disk, kdev_t dev,int*iinfo)
{
int size;

 size = disk->capacity;
 iinfo[0] =64;
 iinfo[1] =32;
 iinfo[2] = size >>11;

/* This should approximate the large drive handling that the DOS ASPI manager
 uses. Drives very near the boundaries may not be handled correctly (i.e.
 near 2.0 Gb and 4.0 Gb) */

if(iinfo[2] >1024) {
 iinfo[0] =64;
 iinfo[1] =63;
 iinfo[2] = disk->capacity / (iinfo[0] * iinfo[1]);
}
if(iinfo[2] >1024) {
 iinfo[0] =128;
 iinfo[1] =63;
 iinfo[2] = disk->capacity / (iinfo[0] * iinfo[1]);
}
if(iinfo[2] >1024) {
 iinfo[0] =255;
 iinfo[1] =63;
 iinfo[2] = disk->capacity / (iinfo[0] * iinfo[1]);
}
return0;
}



struct proc_dir_entry proc_scsi_in2000 = {
 PROC_SCSI_IN2000,6,"in2000",
 S_IFDIR | S_IRUGO | S_IXUGO,2
};


intin2000_proc_info(char*buf,char**start, off_t off,int len,int hn,int in)
{

#ifdef PROC_INTERFACE

char*bp;
char tbuf[128];
unsigned long flags;
struct Scsi_Host *instance;
struct IN2000_hostdata *hd;
Scsi_Cmnd *cmd;
int x,i;
static int stop =0;

for(instance=instance_list; instance; instance=instance->next) {
if(instance->host_no == hn)
break;
}
if(!instance) {
printk("*** Hmm... Can't find host #%d!\n",hn);
return(-ESRCH);
}
 hd = (struct IN2000_hostdata *)instance->hostdata;

/* If 'in' is TRUE we need to _read_ the proc file. We accept the following
 * keywords (same format as command-line, but only ONE per read):
 * debug
 * disconnect
 * period
 * resync
 * proc
 */

if(in) {
 buf[len] ='\0';
 bp = buf;
if(!strncmp(bp,"debug:",6)) {
 bp +=6;
 hd->args =simple_strtoul(bp,NULL,0) & DB_MASK;
}
else if(!strncmp(bp,"disconnect:",11)) {
 bp +=11;
 x =simple_strtoul(bp,NULL,0);
if(x < DIS_NEVER || x > DIS_ALWAYS)
 x = DIS_ADAPTIVE;
 hd->disconnect = x;
}
else if(!strncmp(bp,"period:",7)) {
 bp +=7;
 x =simple_strtoul(bp,NULL,0);
 hd->default_sx_per = sx_table[round_period((unsigned int)x)].period_ns;
}
else if(!strncmp(bp,"resync:",7)) {
 bp +=7;
 x =simple_strtoul(bp,NULL,0);
for(i=0; i<7; i++)
if(x & (1<<i))
 hd->sync_stat[i] = SS_UNSET;
}
else if(!strncmp(bp,"proc:",5)) {
 bp +=5;
 hd->proc =simple_strtoul(bp,NULL,0);
}
else if(!strncmp(bp,"level2:",7)) {
 bp +=7;
 hd->level2 =simple_strtoul(bp,NULL,0);
}
return len;
}

save_flags(flags);
cli();
 bp = buf;
*bp ='\0';
if(hd->proc & PR_VERSION) {
sprintf(tbuf,"\nVersion %s - %s. Compiled %s %s",
 IN2000_VERSION,IN2000_DATE,__DATE__,__TIME__);
strcat(bp,tbuf);
}
if(hd->proc & PR_INFO) {
sprintf(tbuf,"\ndip_switch=%02x: irq=%d io=%02x floppy=%s sync/DOS5=%s",
(hd->dip_switch &0x7f), instance->irq, hd->io_base,
(hd->dip_switch &0x40)?"Yes":"No",
(hd->dip_switch &0x20)?"Yes":"No");
strcat(bp,tbuf);
strcat(bp,"\nsync_xfer[] = ");
for(x=0; x<7; x++) {
sprintf(tbuf,"\t%02x",hd->sync_xfer[x]);
strcat(bp,tbuf);
}
strcat(bp,"\nsync_stat[] = ");
for(x=0; x<7; x++) {
sprintf(tbuf,"\t%02x",hd->sync_stat[x]);
strcat(bp,tbuf);
}
}
#ifdef PROC_STATISTICS
if(hd->proc & PR_STATISTICS) {
strcat(bp,"\ncommands issued: ");
for(x=0; x<7; x++) {
sprintf(tbuf,"\t%ld",hd->cmd_cnt[x]);
strcat(bp,tbuf);
}
strcat(bp,"\ndisconnects allowed:");
for(x=0; x<7; x++) {
sprintf(tbuf,"\t%ld",hd->disc_allowed_cnt[x]);
strcat(bp,tbuf);
}
strcat(bp,"\ndisconnects done: ");
for(x=0; x<7; x++) {
sprintf(tbuf,"\t%ld",hd->disc_done_cnt[x]);
strcat(bp,tbuf);
}
sprintf(tbuf,"\ninterrupts:\t%ld",hd->int_cnt);
strcat(bp,tbuf);
}
#endif
if(hd->proc & PR_CONNECTED) {
strcat(bp,"\nconnected: ");
if(hd->connected) {
 cmd = (Scsi_Cmnd *)hd->connected;
sprintf(tbuf," %ld-%d:%d(%02x)",
 cmd->pid, cmd->target, cmd->lun, cmd->cmnd[0]);
strcat(bp,tbuf);
}
}
if(hd->proc & PR_INPUTQ) {
strcat(bp,"\ninput_Q: ");
 cmd = (Scsi_Cmnd *)hd->input_Q;
while(cmd) {
sprintf(tbuf," %ld-%d:%d(%02x)",
 cmd->pid, cmd->target, cmd->lun, cmd->cmnd[0]);
strcat(bp,tbuf);
 cmd = (Scsi_Cmnd *)cmd->host_scribble;
}
}
if(hd->proc & PR_DISCQ) {
strcat(bp,"\ndisconnected_Q:");
 cmd = (Scsi_Cmnd *)hd->disconnected_Q;
while(cmd) {
sprintf(tbuf," %ld-%d:%d(%02x)",
 cmd->pid, cmd->target, cmd->lun, cmd->cmnd[0]);
strcat(bp,tbuf);
 cmd = (Scsi_Cmnd *)cmd->host_scribble;
}
}
if(hd->proc & PR_TEST) {
;/* insert your own custom function here */
}
strcat(bp,"\n");
restore_flags(flags);
*start = buf;
if(stop) {
 stop =0;
return0;/* return 0 to signal end-of-file */
}
if(off >0x40000)/* ALWAYS stop after 256k bytes have been read */
 stop =1;;
if(hd->proc & PR_STOP)/* stop every other time */
 stop =1;
returnstrlen(bp);

#else/* PROC_INTERFACE */

return0;

#endif/* PROC_INTERFACE */

}


#ifdef MODULE

Scsi_Host_Template driver_template = IN2000;

#include"scsi_module.c"

#endif