/drivers/scsi/in2000.c
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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 <asm/system.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 (hostdat…