Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/scsi/in2000.c b/drivers/scsi/in2000.c
new file mode 100644
index 0000000..0bb0369
--- /dev/null
+++ b/drivers/scsi/in2000.c
@@ -0,0 +1,2323 @@
+/*
+ * 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@redhat.com>
+ * - 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(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, printk("Q-%d-%02x-%ld(", cmd->device->id, cmd->cmnd[0], cmd->pid))
+
+/* Set up a few fields in the Scsi_Cmnd structure for our own use:
+ * - host_scribble is the pointer to the next cmd in the input queue
+ * - scsi_done points to the routine we call when a cmd is finished
+ * - result is what you'd expect
+ */
+ cmd->host_scribble = NULL;
+ cmd->scsi_done = done;
+ cmd->result = 0;
+
+/* We use the Scsi_Pointer structure that's included with each command
+ * as a scratchpad (as it's intended to be used!). The handy thing about
+ * the SCp.xxx fields is that they're always associated with a given
+ * cmd, and are preserved across disconnect-reselect. This means we
+ * can pretty much ignore SAVE_POINTERS and RESTORE_POINTERS messages
+ * if we keep all the critical pointers and counters in SCp:
+ * - SCp.ptr is the pointer into the RAM buffer
+ * - SCp.this_residual is the size of that buffer
+ * - SCp.buffer points to the current scatter-gather buffer
+ * - SCp.buffers_residual tells us how many S.G. buffers there are
+ * - SCp.have_data_in helps keep track of >2048 byte transfers
+ * - SCp.sent_command is not used
+ * - SCp.phase records this command's SRCID_ER bit setting
+ */
+
+ if (cmd->use_sg) {
+ cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
+ cmd->SCp.buffers_residual = cmd->use_sg - 1;
+ cmd->SCp.ptr = (char *) page_address(cmd->SCp.buffer->page) + cmd->SCp.buffer->offset;
+ cmd->SCp.this_residual = cmd->SCp.buffer->length;
+ } else {
+ cmd->SCp.buffer = NULL;
+ cmd->SCp.buffers_residual = 0;
+ cmd->SCp.ptr = (char *) cmd->request_buffer;
+ cmd->SCp.this_residual = cmd->request_bufflen;
+ }
+ cmd->SCp.have_data_in = 0;
+
+/* We don't set SCp.phase here - that's done in in2000_execute() */
+
+/* WD docs state that at the conclusion of a "LEVEL2" command, the
+ * status byte can be retrieved from the LUN register. Apparently,
+ * this is the case only for *uninterrupted* LEVEL2 commands! If
+ * there are any unexpected phases entered, even if they are 100%
+ * legal (different devices may choose to do things differently),
+ * the LEVEL2 command sequence is exited. This often occurs prior
+ * to receiving the status byte, in which case the driver does a
+ * status phase interrupt and gets the status byte on its own.
+ * While such a command can then be "resumed" (ie restarted to
+ * finish up as a LEVEL2 command), the LUN register will NOT be
+ * a valid status byte at the command's conclusion, and we must
+ * use the byte obtained during the earlier interrupt. Here, we
+ * preset SCp.Status to an illegal value (0xff) so that when
+ * this command finally completes, we can tell where the actual
+ * status byte is stored.
+ */
+
+ cmd->SCp.Status = ILLEGAL_STATUS_BYTE;
+
+/* We need to disable interrupts before messing with the input
+ * queue and calling in2000_execute().
+ */
+
+ /*
+ * 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-%ld ", cmd->pid))
+ return 0;
+}
+
+
+
+/*
+ * 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%ld)EX-2 ", (cmd->SCp.phase) ? "d:" : "", cmd->pid))
+
+}
+
+
+
+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 = page_address(cmd->SCp.buffer->page) + cmd->SCp.buffer->offset;
+ }
+
+/* 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 pt_regs *ptregs)
+{
+ 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,%ld", cmd->cmnd[0], cmd->pid))
+ transfer_pio(cmd->cmnd, cmd->cmd_len, DATA_OUT_DIR, hostdata);
+ hostdata->state = S_CONNECTED;
+ break;
+
+
+ case CSR_XFER_DONE | PHS_STATUS:
+ case CSR_UNEXP | PHS_STATUS:
+ case CSR_SRV_REQ | PHS_STATUS:
+ DB(DB_INTR, printk("STATUS="))
+
+ cmd->SCp.Status = read_1_byte(hostdata);
+ DB(DB_INTR, printk("%02x", cmd->SCp.Status))
+ if (hostdata->level2 >= L2_BASIC) {
+ sr = read_3393(hostdata, WD_SCSI_STATUS); /* clear interrupt */
+ hostdata->state = S_RUNNING_LEVEL2;
+ write_3393(hostdata, WD_COMMAND_PHASE, 0x50);
+ write_3393_cmd(hostdata, WD_CMD_SEL_ATN_XFER);
+ } else {
+ hostdata->state = S_CONNECTED;
+ }
+ break;
+
+
+ case CSR_XFER_DONE | PHS_MESS_IN:
+ case CSR_UNEXP | PHS_MESS_IN:
+ case CSR_SRV_REQ | PHS_MESS_IN:
+ DB(DB_INTR, printk("MSG_IN="))
+
+ msg = read_1_byte(hostdata);
+ sr = read_3393(hostdata, WD_SCSI_STATUS); /* clear interrupt */
+
+ hostdata->incoming_msg[hostdata->incoming_ptr] = msg;
+ if (hostdata->incoming_msg[0] == EXTENDED_MESSAGE)
+ msg = EXTENDED_MESSAGE;
+ else
+ hostdata->incoming_ptr = 0;
+
+ cmd->SCp.Message = msg;
+ switch (msg) {
+
+ case COMMAND_COMPLETE:
+ DB(DB_INTR, printk("CCMP-%ld", cmd->pid))
+ write_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
+ hostdata->state = S_PRE_CMP_DISC;
+ break;
+
+ case SAVE_POINTERS:
+ DB(DB_INTR, printk("SDP"))
+ write_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
+ hostdata->state = S_CONNECTED;
+ break;
+
+ case RESTORE_POINTERS:
+ DB(DB_INTR, printk("RDP"))
+ if (hostdata->level2 >= L2_BASIC) {
+ write_3393(hostdata, WD_COMMAND_PHASE, 0x45);
+ write_3393_cmd(hostdata, WD_CMD_SEL_ATN_XFER);
+ hostdata->state = S_RUNNING_LEVEL2;
+ } else {
+ write_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
+ hostdata->state = S_CONNECTED;
+ }
+ break;
+
+ case DISCONNECT:
+ DB(DB_INTR, printk("DIS"))
+ cmd->device->disconnect = 1;
+ write_3393_cmd(hostdata, WD_CMD_NEGATE_ACK);
+ hostdata->state = S_PRE_TMP_DISC;
+ break;
+
+ case MESSAGE_REJECT:
+ DB(DB_INTR, printk("REJ"))
+#ifdef SYNC_DEBUG
+ printk("-REJ-");
+#endif
+ if (hostdata->sync_stat[cmd->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-%ld", cmd->pid))
+ cmd->SCp.Message = COMMAND_COMPLETE;
+ lun = read_3393(hostdata, WD_TARGET_LUN);
+ DB(DB_INTR, printk(":%d.%d", cmd->SCp.Status, lun))
+ hostdata->connected = NULL;
+ hostdata->busy[cmd->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-%ld: Unknown SEL_XFER_DONE phase!!---", asr, sr, phs, cmd->pid);
+ }
+ break;
+
+
+/* Note: this interrupt will occur only after a LEVEL2 command */
+
+ case CSR_SDP:
+ DB(DB_INTR, printk("SDP"))
+ hostdata->state = S_RUNNING_LEVEL2;
+ write_3393(hostdata, WD_COMMAND_PHASE, 0x41);
+ write_3393_cmd(hostdata, WD_CMD_SEL_ATN_XFER);
+ break;
+
+
+ case CSR_XFER_DONE | PHS_MESS_OUT:
+ case CSR_UNEXP | PHS_MESS_OUT:
+ case CSR_SRV_REQ | PHS_MESS_OUT:
+ DB(DB_INTR, printk("MSG_OUT="))
+
+/* To get here, we've probably requested MESSAGE_OUT and have
+ * already put the correct bytes in outgoing_msg[] and filled
+ * in outgoing_len. We simply send them out to the SCSI bus.
+ * Sometimes we get MESSAGE_OUT phase when we're not expecting
+ * it - like when our SDTR message is rejected by a target. Some
+ * targets send the REJECT before receiving all of the extended
+ * message, and then seem to go back to MESSAGE_OUT for a byte
+ * or two. Not sure why, or if I'm doing something wrong to
+ * cause this to happen. Regardless, it seems that sending
+ * NOP messages in these situations results in no harm and
+ * makes everyone happy.
+ */
+ if (hostdata->outgoing_len == 0) {
+ hostdata->outgoing_len = 1;
+ hostdata->outgoing_msg[0] = NOP;
+ }
+ transfer_pio(hostdata->outgoing_msg, hostdata->outgoing_len, DATA_OUT_DIR, hostdata);
+ DB(DB_INTR, printk("%02x", hostdata->outgoing_msg[0]))
+ hostdata->outgoing_len = 0;
+ hostdata->state = S_CONNECTED;
+ break;
+
+
+ case CSR_UNEXP_DISC:
+
+/* I think I've seen this after a request-sense that was in response
+ * to an error condition, but not sure. We certainly need to do
+ * something when we get this interrupt - the question is 'what?'.
+ * Let's think positively, and assume some command has finished
+ * in a legal manner (like a command that provokes a request-sense),
+ * so we treat it as a normal command-complete-disconnect.
+ */
+
+
+/* Make sure that reselection is enabled at this point - it may
+ * have been turned off for the command that just completed.
+ */
+
+ write_3393(hostdata, WD_SOURCE_ID, SRCID_ER);
+ if (cmd == NULL) {
+ printk(" - Already disconnected! ");
+ hostdata->state = S_UNCONNECTED;
+
+/* release the SMP spin_lock and restore irq state */
+ spin_unlock_irqrestore(instance->host_lock, flags);
+ return IRQ_HANDLED;
+ }
+ DB(DB_INTR, printk("UNEXP_DISC-%ld", cmd->pid))
+ 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-%ld", cmd->pid))
+ if (cmd == NULL) {
+ printk(" - Already disconnected! ");
+ hostdata->state = S_UNCONNECTED;
+ }
+ switch (hostdata->state) {
+ case S_PRE_CMP_DISC:
+ hostdata->connected = NULL;
+ hostdata->busy[cmd->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;
+
+ DB(DB_INTR, printk("-%ld", cmd->pid))
+ break;
+
+ default:
+ printk("--UNKNOWN INTERRUPT:%02x:%02x:%02x--", asr, sr, phs);
+ }
+
+ write1_io(0, IO_LED_OFF);
+
+ DB(DB_INTR, printk("} "))
+
+/* release the SMP spin_lock and restore irq state */
+ 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;
+
+ instance = cmd->device->host;
+ hostdata = (struct IN2000_hostdata *) instance->hostdata;
+
+ printk(KERN_WARNING "scsi%d: Reset. ", instance->host_no);
+
+ /* 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;
+ return SUCCESS;
+}
+
+static int in2000_host_reset(Scsi_Cmnd * cmd)
+{
+ return FAILED;
+}
+
+static int in2000_device_reset(Scsi_Cmnd * cmd)
+{
+ return FAILED;
+}
+
+
+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 %ld from input_Q. ", instance->host_no, cmd->pid);
+ 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 %ld - ", instance->host_no, cmd->pid);
+
+ printk("sending wd33c93 ABORT command - ");
+ write_3393(hostdata, WD_CONTROL, CTRL_IDI | CTRL_EDI | CTRL_POLLED);
+ write_3393_cmd(hostdata, WD_CMD_ABORT);
+
+/* Now we have to attempt to flush out the FIFO... */
+
+ printk("flushing fifo - ");
+ timeout = 1000000;
+ do {
+ asr = READ_AUX_STAT();
+ if (asr & ASR_DBR)
+ read_3393(hostdata, WD_DATA);
+ } while (!(asr & ASR_INT) && timeout-- > 0);
+ sr = read_3393(hostdata, WD_SCSI_STATUS);
+ printk("asr=%02x, sr=%02x, %ld bytes un-transferred (timeout=%ld) - ", asr, sr, read_3393_count(hostdata), timeout);
+
+ /*
+ * Abort command processed.
+ * Still connected.
+ * We must disconnect.
+ */
+
+ printk("sending wd33c93 DISCONNECT command - ");
+ write_3393_cmd(hostdata, WD_CMD_DISCONNECT);
+
+ timeout = 1000000;
+ asr = READ_AUX_STAT();
+ while ((asr & ASR_CIP) && timeout-- > 0)
+ asr = READ_AUX_STAT();
+ sr = read_3393(hostdata, WD_SCSI_STATUS);
+ printk("asr=%02x, sr=%02x.", asr, sr);
+
+ hostdata->busy[cmd->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;
+}
+
+
+
+#define MAX_IN2000_HOSTS 3
+#define MAX_SETUP_ARGS (sizeof(setup_args) / sizeof(char *))
+#define SETUP_BUFFER_SIZE 200
+static char setup_buffer[SETUP_BUFFER_SIZE];
+static char setup_used[MAX_SETUP_ARGS];
+static int done_setup = 0;
+
+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 __init in2000_detect(Scsi_Host_Template * tpnt)
+{
+ struct Scsi_Host *instance;
+ struct IN2000_hostdata *hostdata;
+ int detect_count;
+ int bios;
+ int x;
+ unsigned short base;
+ uchar switches;
+ uchar hrev;
+ 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++) {
+ 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 (isa_readl(bios_tab[bios] + 0x10) == 0x41564f4e || isa_readl(bios_tab[bios] + 0x30) == 0x61776c41) {
+ printk("Found IN2000 BIOS at 0x%x ", (unsigned int) bios_tab[bios]);
+
+/* Read the switch image that's mapped into EPROM space */
+
+ switches = ~((isa_readb(bios_tab[bios] + 0x20) & 0xff));
+
+/* Find out where the IO space is */
+
+ x = switches & (SW_ADDR0 | SW_ADDR1);
+ base = base_tab[x];
+
+/* Check for the IN2000 signature in IO space. */
+
+ x = ~inb(base + IO_SWITCHES) & 0xff;
+ if (x != switches) {
+ printk("Bad IO signature: %02x vs %02x.\n", x, switches);
+ continue;
+ }
+ } else
+ continue;
+
+/* OK. We have a base address for the IO ports - run a few safety checks */
+
+ if (!(switches & SW_BIT7)) { /* I _think_ all cards do this */
+ printk("There is no IN-2000 SCSI card at IOport 0x%03x!\n", base);
+ continue;
+ }
+
+/* Let's assume any hardware version will work, although the driver
+ * has only been tested on 0x21, 0x22, 0x25, 0x26, and 0x27. We'll
+ * print out the rev number for reference later, but accept them all.
+ */
+
+ hrev = inb(base + IO_HARDWARE);
+
+ /* Bit 2 tells us if interrupts are disabled */
+ if (switches & SW_DISINT) {
+ printk("The IN-2000 SCSI card at IOport 0x%03x ", base);
+ printk("is not configured for interrupt operation!\n");
+ printk("This driver requires an interrupt: cancelling detection.\n");
+ continue;
+ }
+
+/* Ok. We accept that there's an IN2000 at ioaddr 'base'. Now
+ * initialize it.
+ */
+
+ tpnt->proc_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, SA_INTERRUPT, "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 (isa_readl(bios_tab[bios] + 0x10) == 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_proc_info(struct Scsi_Host *instance, char *buf, char **start, off_t off, int len, int in)
+{
+
+#ifdef PROC_INTERFACE
+
+ char *bp;
+ char tbuf[128];
+ unsigned long flags;
+ struct IN2000_hostdata *hd;
+ Scsi_Cmnd *cmd;
+ int x, i;
+ static int stop = 0;
+
+ hd = (struct IN2000_hostdata *) instance->hostdata;
+
+/* If 'in' is TRUE we need to _read_ the proc file. We accept the following
+ * keywords (same format as command-line, but only ONE per read):
+ * debug
+ * disconnect
+ * period
+ * resync
+ * proc
+ */
+
+ if (in) {
+ buf[len] = '\0';
+ bp = buf;
+ if (!strncmp(bp, "debug:", 6)) {
+ bp += 6;
+ hd->args = simple_strtoul(bp, NULL, 0) & DB_MASK;
+ } else if (!strncmp(bp, "disconnect:", 11)) {
+ bp += 11;
+ x = simple_strtoul(bp, NULL, 0);
+ if (x < DIS_NEVER || x > DIS_ALWAYS)
+ x = DIS_ADAPTIVE;
+ hd->disconnect = x;
+ } else if (!strncmp(bp, "period:", 7)) {
+ bp += 7;
+ x = simple_strtoul(bp, NULL, 0);
+ hd->default_sx_per = sx_table[round_period((unsigned int) x)].period_ns;
+ } else if (!strncmp(bp, "resync:", 7)) {
+ bp += 7;
+ x = simple_strtoul(bp, NULL, 0);
+ for (i = 0; i < 7; i++)
+ if (x & (1 << i))
+ hd->sync_stat[i] = SS_UNSET;
+ } else if (!strncmp(bp, "proc:", 5)) {
+ bp += 5;
+ hd->proc = simple_strtoul(bp, NULL, 0);
+ } else if (!strncmp(bp, "level2:", 7)) {
+ bp += 7;
+ hd->level2 = simple_strtoul(bp, NULL, 0);
+ }
+ return len;
+ }
+
+ spin_lock_irqsave(instance->host_lock, flags);
+ bp = buf;
+ *bp = '\0';
+ if (hd->proc & PR_VERSION) {
+ sprintf(tbuf, "\nVersion %s - %s. Compiled %s %s", IN2000_VERSION, IN2000_DATE, __DATE__, __TIME__);
+ strcat(bp, tbuf);
+ }
+ if (hd->proc & PR_INFO) {
+ sprintf(tbuf, "\ndip_switch=%02x: irq=%d io=%02x floppy=%s sync/DOS5=%s", (hd->dip_switch & 0x7f), instance->irq, hd->io_base, (hd->dip_switch & 0x40) ? "Yes" : "No", (hd->dip_switch & 0x20) ? "Yes" : "No");
+ strcat(bp, tbuf);
+ strcat(bp, "\nsync_xfer[] = ");
+ for (x = 0; x < 7; x++) {
+ sprintf(tbuf, "\t%02x", hd->sync_xfer[x]);
+ strcat(bp, tbuf);
+ }
+ strcat(bp, "\nsync_stat[] = ");
+ for (x = 0; x < 7; x++) {
+ sprintf(tbuf, "\t%02x", hd->sync_stat[x]);
+ strcat(bp, tbuf);
+ }
+ }
+#ifdef PROC_STATISTICS
+ if (hd->proc & PR_STATISTICS) {
+ strcat(bp, "\ncommands issued: ");
+ for (x = 0; x < 7; x++) {
+ sprintf(tbuf, "\t%ld", hd->cmd_cnt[x]);
+ strcat(bp, tbuf);
+ }
+ strcat(bp, "\ndisconnects allowed:");
+ for (x = 0; x < 7; x++) {
+ sprintf(tbuf, "\t%ld", hd->disc_allowed_cnt[x]);
+ strcat(bp, tbuf);
+ }
+ strcat(bp, "\ndisconnects done: ");
+ for (x = 0; x < 7; x++) {
+ sprintf(tbuf, "\t%ld", hd->disc_done_cnt[x]);
+ strcat(bp, tbuf);
+ }
+ sprintf(tbuf, "\ninterrupts: \t%ld", hd->int_cnt);
+ strcat(bp, tbuf);
+ }
+#endif
+ if (hd->proc & PR_CONNECTED) {
+ strcat(bp, "\nconnected: ");
+ if (hd->connected) {
+ cmd = (Scsi_Cmnd *) hd->connected;
+ sprintf(tbuf, " %ld-%d:%d(%02x)", cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+ strcat(bp, tbuf);
+ }
+ }
+ if (hd->proc & PR_INPUTQ) {
+ strcat(bp, "\ninput_Q: ");
+ cmd = (Scsi_Cmnd *) hd->input_Q;
+ while (cmd) {
+ sprintf(tbuf, " %ld-%d:%d(%02x)", cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+ strcat(bp, tbuf);
+ cmd = (Scsi_Cmnd *) cmd->host_scribble;
+ }
+ }
+ if (hd->proc & PR_DISCQ) {
+ strcat(bp, "\ndisconnected_Q:");
+ cmd = (Scsi_Cmnd *) hd->disconnected_Q;
+ while (cmd) {
+ sprintf(tbuf, " %ld-%d:%d(%02x)", cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
+ strcat(bp, tbuf);
+ cmd = (Scsi_Cmnd *) cmd->host_scribble;
+ }
+ }
+ if (hd->proc & PR_TEST) {
+ ; /* insert your own custom function here */
+ }
+ strcat(bp, "\n");
+ spin_unlock_irqrestore(instance->host_lock, flags);
+ *start = buf;
+ if (stop) {
+ stop = 0;
+ return 0; /* return 0 to signal end-of-file */
+ }
+ if (off > 0x40000) /* ALWAYS stop after 256k bytes have been read */
+ stop = 1;
+ if (hd->proc & PR_STOP) /* stop every other time */
+ stop = 1;
+ return strlen(bp);
+
+#else /* PROC_INTERFACE */
+
+ return 0;
+
+#endif /* PROC_INTERFACE */
+
+}
+
+MODULE_LICENSE("GPL");
+
+
+static Scsi_Host_Template driver_template = {
+ .proc_name = "in2000",
+ .proc_info = in2000_proc_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,
+ .eh_device_reset_handler = in2000_device_reset,
+ .eh_host_reset_handler = in2000_host_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"