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TP-Link_Archer-XR500v/EN7526G_3.18Kernel_SDK/linux-3.18.21/drivers/scsi/in2000.c
Matheus Sampaio Queiroga aaca98136a
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2024-07-22 01:58:46 -03:00

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/*
* 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.
*
* For the avoidance of doubt the "preferred form" of this code is one which
* is in an open non patent encumbered format. Where cryptographic key signing
* forms part of the process of creating an executable the information
* including keys needed to generate an equivalently functional executable
* are deemed to be part of the source code.
*
* 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".
*
* Updated for Linux 2.5 by Alan Cox <alan@lxorguk.ukuu.org.uk>
* - Using new_eh handler
* - Hopefully got all the locking right again
* See "FIXME" notes for items that could do with more work
*/
#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/ioport.h>
#include <linux/stat.h>
#include <asm/io.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#define IN2000_VERSION "1.33-2.5"
#define IN2000_DATE "2002/11/03"
#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;
module_param(setup_strings, charp, 0);
static inline uchar read_3393(struct IN2000_hostdata *hostdata, uchar reg_num)
{
write1_io(reg_num, IO_WD_ADDR);
return read1_io(IO_WD_DATA);
}
#define READ_AUX_STAT() read1_io(IO_WD_ASR)
static inline void write_3393(struct IN2000_hostdata *hostdata, uchar reg_num, uchar value)
{
write1_io(reg_num, IO_WD_ADDR);
write1_io(value, IO_WD_DATA);
}
static inline void write_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 void write_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 long read_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 int is_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:
case 0xea:
return 1;
default:
return 0;
}
}
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 int round_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;
}
}
return 7;
}
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 void in2000_execute(struct Scsi_Host *instance);
static int in2000_queuecommand_lck(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
{
struct Scsi_Host *instance;
struct IN2000_hostdata *hostdata;
Scsi_Cmnd *tmp;
instance = cmd->device->host;
hostdata = (struct IN2000_hostdata *) instance->hostdata;
DB(DB_QUEUE_COMMAND, scmd_printk(KERN_DEBUG, cmd, "Q-%02x(", cmd->cmnd[0]))
/* 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 (scsi_bufflen(cmd)) {
cmd->SCp.buffer = scsi_sglist(cmd);
cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
cmd->SCp.this_residual = cmd->SCp.buffer->length;
} else {
cmd->SCp.buffer = NULL;
cmd->SCp.buffers_residual = 0;
cmd->SCp.ptr = NULL;
cmd->SCp.this_residual = 0;
}
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().
*/
/*
* 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->device->host);
DB(DB_QUEUE_COMMAND, printk(")Q "))
return 0;
}
static DEF_SCSI_QCMD(in2000_queuecommand)
/*
* 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 void in2000_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 = NULL;
while (cmd) {
if (!(hostdata->busy[cmd->device->id] & (1 << cmd->device->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->device->id]++;
#endif
/*
* Start the selection process
*/
if (is_dir_out(cmd))
write_3393(hostdata, WD_DESTINATION_ID, cmd->device->id);
else
write_3393(hostdata, WD_DESTINATION_ID, cmd->device->id | 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->device->id != cmd->device->id) || (prev->device->lun != cmd->device->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->device->id]++;
#endif
no:
write_3393(hostdata, WD_SOURCE_ID, ((cmd->SCp.phase) ? SRCID_ER : 0));
write_3393(hostdata, WD_TARGET_LUN, cmd->device->lun);
write_3393(hostdata, WD_SYNCHRONOUS_TRANSFER, hostdata->sync_xfer[cmd->device->id]);
hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
if ((hostdata->level2 <= L2_NONE) || (hostdata->sync_stat[cmd->device->id] == 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->device->id] == SS_UNSET) {
if (hostdata->sync_off & (1 << cmd->device->id))
hostdata->sync_stat[cmd->device->id] = SS_SET;
else
hostdata->sync_stat[cmd->device->id] = 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 transferred 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)EX-2 ", (cmd->SCp.phase) ? "d:" : ""))
}
static void transfer_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 void transfer_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->device->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 = sg_virt(cmd->SCp.buffer);
}
/* Set up hardware registers */
write_3393(hostdata, WD_SYNCHRONOUS_TRANSFER, hostdata->sync_xfer[cmd->device->id]);
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 irqreturn_t in2000_intr(int irqnum, void *dev_id)
{
struct Scsi_Host *instance = dev_id;
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;
hostdata = (struct IN2000_hostdata *) instance->hostdata;
/* Get the spin_lock and disable further ints, for SMP */
spin_lock_irqsave(instance->host_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 */
spin_unlock_irqrestore(instance->host_lock, flags);
return IRQ_HANDLED;
}
/* 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 */
spin_unlock_irqrestore(instance->host_lock, flags);
return IRQ_HANDLED;
}
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->device->id] &= ~(1 << cmd->device->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->device->lun);
if (cmd->SCp.phase)
hostdata->outgoing_msg[0] |= 0x40;
if (hostdata->sync_stat[cmd->device->id] == SS_FIRST) {
#ifdef SYNC_DEBUG
printk(" sending SDTR ");
#endif
hostdata->sync_stat[cmd->device->id] = 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", cmd->cmnd[0]))
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"))
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->device->id] == SS_WAITING)
hostdata->sync_stat[cmd->device->id] = 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->device->id] != 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->device->id] = calc_sync_xfer(hostdata->default_sx_per / 4, 0);
} else {
hostdata->sync_xfer[cmd->device->id] = id;
}
#ifdef SYNC_DEBUG
printk("sync_xfer=%02x", hostdata->sync_xfer[cmd->device->id]);
#endif
hostdata->sync_stat[cmd->device->id] = 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"))
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->device->id] &= ~(1 << cmd->device->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: Unknown SEL_XFER_DONE phase!!---", asr, sr, phs);
}
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 */
spin_unlock_irqrestore(instance->host_lock, flags);
return IRQ_HANDLED;
}
DB(DB_INTR, printk("UNEXP_DISC"))
hostdata->connected = NULL;
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->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"))
if (cmd == NULL) {
printk(" - Already disconnected! ");
hostdata->state = S_UNCONNECTED;
}
switch (hostdata->state) {
case S_PRE_CMP_DISC:
hostdata->connected = NULL;
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->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->device->id]++;
#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->device->id] &= ~(1 << cmd->device->lun);
cmd->host_scribble = (uchar *) hostdata->input_Q;
hostdata->input_Q = cmd;
}
}
else {
if (cmd) {
if (phs == 0x00) {
hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->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->device->id && lun == cmd->device->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->device->id);
else
write_3393(hostdata, WD_DESTINATION_ID, cmd->device->id | 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;
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 */
spin_unlock_irqrestore(instance->host_lock, flags);
return IRQ_HANDLED;
}
#define RESET_CARD 0
#define RESET_CARD_AND_BUS 1
#define B_FLAG 0x80
/*
* Caller must hold instance lock!
*/
static int reset_hardware(struct Scsi_Host *instance, int type)
{
struct IN2000_hostdata *hostdata;
int qt, x;
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));
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);
/* FIXME: timeout ?? */
while (!(READ_AUX_STAT() & ASR_INT))
cpu_relax(); /* wait for RESET to complete */
x = read_3393(hostdata, WD_SCSI_STATUS); /* clear interrupt */
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;
}
static int in2000_bus_reset(Scsi_Cmnd * cmd)
{
struct Scsi_Host *instance;
struct IN2000_hostdata *hostdata;
int x;
unsigned long flags;
instance = cmd->device->host;
hostdata = (struct IN2000_hostdata *) instance->hostdata;
printk(KERN_WARNING "scsi%d: Reset. ", instance->host_no);
spin_lock_irqsave(instance->host_lock, flags);
/* 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;
spin_unlock_irqrestore(instance->host_lock, flags);
return SUCCESS;
}
static int __in2000_abort(Scsi_Cmnd * cmd)
{
struct Scsi_Host *instance;
struct IN2000_hostdata *hostdata;
Scsi_Cmnd *tmp, *prev;
uchar sr, asr;
unsigned long timeout;
instance = cmd->device->host;
hostdata = (struct IN2000_hostdata *) instance->hostdata;
printk(KERN_DEBUG "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 = NULL;
while (tmp) {
if (tmp == cmd) {
if (prev)
prev->host_scribble = cmd->host_scribble;
cmd->host_scribble = NULL;
cmd->result = DID_ABORT << 16;
printk(KERN_WARNING "scsi%d: Abort - removing command from input_Q. ", instance->host_no);
cmd->scsi_done(cmd);
return 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(KERN_WARNING "scsi%d: Aborting connected command - ", instance->host_no);
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->device->id] &= ~(1 << cmd->device->lun);
hostdata->connected = NULL;
hostdata->state = S_UNCONNECTED;
cmd->result = DID_ABORT << 16;
cmd->scsi_done(cmd);
in2000_execute(instance);
return 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) {
printk(KERN_DEBUG "scsi%d: unable to abort disconnected command.\n", instance->host_no);
return FAILED;
}
/*
* 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);
printk("scsi%d: warning : SCSI command probably completed successfully" " before abortion. ", instance->host_no);
return SUCCESS;
}
static int in2000_abort(Scsi_Cmnd * cmd)
{
int rc;
spin_lock_irq(cmd->device->host->host_lock);
rc = __in2000_abort(cmd);
spin_unlock_irq(cmd->device->host->host_lock);
return rc;
}
#define MAX_IN2000_HOSTS 3
#define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)
#define SETUP_BUFFER_SIZE 200
static char setup_buffer[SETUP_BUFFER_SIZE];
static char setup_used[MAX_SETUP_ARGS];
static int done_setup = 0;
static void __init in2000_setup(char *str, int *ints)
{
int i;
char *p1, *p2;
strlcpy(setup_buffer, str, SETUP_BUFFER_SIZE);
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 *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)
return 0;
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 u32 bios_tab[] in2000__INITDATA = {
0xc8000,
0xd0000,
0xd8000,
0
};
static unsigned short base_tab[] in2000__INITDATA = {
0x220,
0x200,
0x110,
0x100,
};
static int int_tab[] in2000__INITDATA = {
15,
14,
11,
10
};
static int probe_bios(u32 addr, u32 *s1, uchar *switches)
{
void __iomem *p = ioremap(addr, 0x34);
if (!p)
return 0;
*s1 = readl(p + 0x10);
if (*s1 == 0x41564f4e || readl(p + 0x30) == 0x61776c41) {
/* Read the switch image that's mapped into EPROM space */
*switches = ~readb(p + 0x20);
iounmap(p);
return 1;
}
iounmap(p);
return 0;
}
static int __init in2000_detect(struct 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;
unsigned long 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, NULL);
detect_count = 0;
for (bios = 0; bios_tab[bios]; bios++) {
u32 s1 = 0;
if (check_setup_args("ioport", &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 (probe_bios(bios_tab[bios], &s1, &switches)) {
printk("Found IN2000 BIOS at 0x%x ", (unsigned int) bios_tab[bios]);
/* 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_name = "in2000";
instance = scsi_register(tpnt, sizeof(struct IN2000_hostdata));
if (instance == NULL)
continue;
detect_count++;
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, 0, "in2000", instance)) {
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 (s1 == 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", &val, buf))
hostdata->sync_off = val;
if (check_setup_args("period", &val, buf))
hostdata->default_sx_per = sx_table[round_period((unsigned int) val)].period_ns;
if (check_setup_args("disconnect", &val, buf)) {
if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
hostdata->disconnect = val;
else
hostdata->disconnect = DIS_ADAPTIVE;
}
if (check_setup_args("noreset", &val, buf))
hostdata->args ^= A_NO_SCSI_RESET;
if (check_setup_args("level2", &val, buf))
hostdata->level2 = val;
if (check_setup_args("debug", &val, buf))
hostdata->args = (val & DB_MASK);
#ifdef PROC_INTERFACE
if (check_setup_args("proc", &val, buf))
hostdata->proc = val;
#endif
/* FIXME: not strictly needed I think but the called code expects
to be locked */
spin_lock_irqsave(instance->host_lock, flags);
x = reset_hardware(instance, (hostdata->args & A_NO_SCSI_RESET) ? RESET_CARD : RESET_CARD_AND_BUS);
spin_unlock_irqrestore(instance->host_lock, flags);
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;
}
static int in2000_release(struct Scsi_Host *shost)
{
if (shost->irq)
free_irq(shost->irq, shost);
if (shost->io_port && shost->n_io_port)
release_region(shost->io_port, shost->n_io_port);
return 0;
}
/* 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...
*/
static int in2000_biosparam(struct scsi_device *sdev, struct block_device *bdev, sector_t capacity, int *iinfo)
{
int size;
size = 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] = (unsigned long) capacity / (iinfo[0] * iinfo[1]);
}
if (iinfo[2] > 1024) {
iinfo[0] = 128;
iinfo[1] = 63;
iinfo[2] = (unsigned long) capacity / (iinfo[0] * iinfo[1]);
}
if (iinfo[2] > 1024) {
iinfo[0] = 255;
iinfo[1] = 63;
iinfo[2] = (unsigned long) capacity / (iinfo[0] * iinfo[1]);
}
return 0;
}
static int in2000_write_info(struct Scsi_Host *instance, char *buf, int len)
{
#ifdef PROC_INTERFACE
char *bp;
struct IN2000_hostdata *hd;
int x, i;
hd = (struct IN2000_hostdata *) instance->hostdata;
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);
}
#endif
return len;
}
static int in2000_show_info(struct seq_file *m, struct Scsi_Host *instance)
{
#ifdef PROC_INTERFACE
unsigned long flags;
struct IN2000_hostdata *hd;
Scsi_Cmnd *cmd;
int x;
hd = (struct IN2000_hostdata *) instance->hostdata;
spin_lock_irqsave(instance->host_lock, flags);
if (hd->proc & PR_VERSION)
seq_printf(m, "\nVersion %s - %s.", IN2000_VERSION, IN2000_DATE);
if (hd->proc & PR_INFO) {
seq_printf(m, "\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");
seq_printf(m, "\nsync_xfer[] = ");
for (x = 0; x < 7; x++)
seq_printf(m, "\t%02x", hd->sync_xfer[x]);
seq_printf(m, "\nsync_stat[] = ");
for (x = 0; x < 7; x++)
seq_printf(m, "\t%02x", hd->sync_stat[x]);
}
#ifdef PROC_STATISTICS
if (hd->proc & PR_STATISTICS) {
seq_printf(m, "\ncommands issued: ");
for (x = 0; x < 7; x++)
seq_printf(m, "\t%ld", hd->cmd_cnt[x]);
seq_printf(m, "\ndisconnects allowed:");
for (x = 0; x < 7; x++)
seq_printf(m, "\t%ld", hd->disc_allowed_cnt[x]);
seq_printf(m, "\ndisconnects done: ");
for (x = 0; x < 7; x++)
seq_printf(m, "\t%ld", hd->disc_done_cnt[x]);
seq_printf(m, "\ninterrupts: \t%ld", hd->int_cnt);
}
#endif
if (hd->proc & PR_CONNECTED) {
seq_printf(m, "\nconnected: ");
if (hd->connected) {
cmd = (Scsi_Cmnd *) hd->connected;
seq_printf(m, " %d:%llu(%02x)", cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
}
}
if (hd->proc & PR_INPUTQ) {
seq_printf(m, "\ninput_Q: ");
cmd = (Scsi_Cmnd *) hd->input_Q;
while (cmd) {
seq_printf(m, " %d:%llu(%02x)", cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
cmd = (Scsi_Cmnd *) cmd->host_scribble;
}
}
if (hd->proc & PR_DISCQ) {
seq_printf(m, "\ndisconnected_Q:");
cmd = (Scsi_Cmnd *) hd->disconnected_Q;
while (cmd) {
seq_printf(m, " %d:%llu(%02x)", cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
cmd = (Scsi_Cmnd *) cmd->host_scribble;
}
}
if (hd->proc & PR_TEST) {
; /* insert your own custom function here */
}
seq_printf(m, "\n");
spin_unlock_irqrestore(instance->host_lock, flags);
#endif /* PROC_INTERFACE */
return 0;
}
MODULE_LICENSE("GPL");
static struct scsi_host_template driver_template = {
.proc_name = "in2000",
.write_info = in2000_write_info,
.show_info = in2000_show_info,
.name = "Always IN2000",
.detect = in2000_detect,
.release = in2000_release,
.queuecommand = in2000_queuecommand,
.eh_abort_handler = in2000_abort,
.eh_bus_reset_handler = in2000_bus_reset,
.bios_param = in2000_biosparam,
.can_queue = IN2000_CAN_Q,
.this_id = IN2000_HOST_ID,
.sg_tablesize = IN2000_SG,
.cmd_per_lun = IN2000_CPL,
.use_clustering = DISABLE_CLUSTERING,
};
#include "scsi_module.c"
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